If you've ever faced stubborn algae stains on your concrete surfaces, you know how tough it can be to restore that pristine, clean look. Whether it's a slippery driveway, a greenish patio, or a walkway that looks like it's been abandoned for years, best concrete cleaner for algae is your ultimate weapon against the unsightly green invasion.
Algae growth not only affects the look of your property but can also make surfaces slippery and unsafe. That’s why you need a powerful cleaner that doesn’t just remove the algae but also ensures long-term protection to prevent future buildup.
The good news? We’ve compiled the top picks of best concrete cleaner for algae to help you easily find the perfect solution that works best for your needs. Say goodbye to slippery, grimy concrete and hello to a sparkling clean surface with these top-rated algae cleaners
Wet & Forget Concentrate Outdoor Cleaner removes green and black stains caused by moss, mold, mildew, and algae, no scrubbing, no rinsing, no pressure washing, just wet it and forgetSurfaces including driveway, patio, roof, siding, deck, vinyl, wood, concrete, canvas, aluminum, and upholsteryMix 1 p
Key specs
- Application Method
- Garden sprayer at 1:5 dilution with water
- Action Timeline
- Green stains typically lift within 1 to 2 weeks, while stubborn black growth can take several months of natural weather exposure to clear completely.
Pros:
- Requires no scrubbing, rinsing, or pressure washing after application
- Cleans over time with wind and rain, keeping surfaces clear up to a full year
- Dilutes at a 1 to 5 ratio with water to yield substantial working solution
- Mixed formula can remain stored in the garden sprayer for future use
Cons:
- Demands patience as green algae takes 1 to 2 weeks and black stains take months
- Requires a separate garden sprayer since no applicator is included in the jug
REMOVE TOUGH STAINS: Home Armor Power Clean Wand blasts away stains from mold, mildew, algae, dirt and grime. No scrubbing required.2X CLEANING POWER of ordinary outdoor cleaners. The Power Clean Wand combines super-concentrated cleaning tablets with an easy-to-use cartridge refill system.VISIBLE RES
Key specs
- System Format
- Tablet cartridge wand with hose attachment
- Safety Requirements
- Wear rubber gloves and eye protection during use
- Outdoor spaces only
- Single-use cartridge cannot be refilled
Pros:
- Delivers visible stain removal in seconds without requiring manual scrubbing
- Uses concentrated tablet cartridges designed for direct hose attachment
- Cleans multiple outdoor materials including concrete, pavers, and brick
Cons:
- Single-use cartridge cannot be refilled or reused once empty
- Mandates protective gear including rubber gloves and eye protection
CLEANS AND BRIGHTENS IN MINUTES: Blast away dirt, mold and algae stains with Mold Armor E-Z House Wash. Your siding will look bright and new – no ladder or scrubbing required. Cleans up to 4,500 sq. ft.POWERFUL CLEANING ACTION: This house cleaner removes dirt while killing stains down to the roots.
Key specs
- Coverage Area
- Up to 4,500 sq ft per 64 fl oz bottle
- Dwell and Rinse Time
- Mold Armor requires spraying the surface, allowing the foaming formula to cling for 10 minutes, and rinsing thoroughly with water.
Pros:
- Built-in hose-end adapter covers up to 4,500 square feet without extra tools
- Microban foaming formula clings to vertical concrete and masonry surfaces
- Fast 10-minute dwell time before a simple garden hose rinse
Cons:
- Rinsing with a garden hose is mandatory after the 10-minute wait
- Requires adequate outdoor water hose pressure to dispense properly
GET RID OF STUBBORN MOLD AND MILDEW STAINS: Our instant spray cleaner removes the stains left behind from black mold and mildew. They tend to leave behind ugly staining that can go deep below the surface; Our professional-strength spray is specifically formulated to eliminate discoloration caused by
Key specs
- Formula Readiness
- Ready-to-use liquid, no dilution required
- Application Requirement
- Spray directly onto affected concrete or masonry; proper PPE and ventilation are required to handle this professional-strength formula safely.
Pros:
- Fast-acting formula dissolves deep stains on contact without scrubbing
- Arrives ready to use without requiring water dilution or mixing
- Treats concrete floors along with wood, drywall, and brick surfaces
Cons:
- Requires personal protective equipment and ample ventilation during application
- Jug does not include an integrated spray nozzle or hose attachment
Cleans driveways, walkways, patios and masonryEliminates tough oil stains, rust stains, grease, automotive fluids, tire marks, exhaust buildup and moreUses the power of peroxide to lift grime without harsh chemicalsProduct container may vary from image shown
Key specs
- Cleaning Agent
- Peroxide-based cleaner
- Equipment Compatibility
- Designed specifically for pressure washer chemical injectors to treat concrete driveways, walkways, and masonry surfaces.
Pros:
- Formulated specifically for pressure washers to clean driveways and walkways
- Peroxide-based action lifts grime and stains without harsh chemical runoff
- Lifts tough automotive fluids, grease, and rust alongside surface growth
Cons:
- Requires a pressure washer machine to apply and rinse effectively
- Package does not specify total square footage coverage per container
New & Improved Nozzle! Xtreme Reach Hose End Outdoor Cleaner attaches to garden hose; jet tip sprays up to 30ft to remove green and black stains caused by moss, mold, mildew, and algae on roofs and siding; fan tip provides quick application to driveways and decks; no rinsingSpray dry surface on a co
Key specs
- Sprayer Reach
- Up to 30 ft with integrated jet tip nozzle
- Environmental Directions
- Apply at least 100 feet away from open waterways
- Flush nearby plants with water before and after application
- Apply when dry and above 55 degrees Fahrenheit
Pros:
- Integrated nozzle features a 30-foot jet tip and a wide fan tip for quick reach
- Bleach-free and non-acidic formula avoids damaging surrounding building materials
- Requires no rinsing or pressure washing after spraying onto concrete
- Treats up to 2,000 square feet from a compact 48-fluid-ounce bottle
Cons:
- Must be applied at outdoor temperatures above 55 degrees Fahrenheit
- Requires flushing surrounding landscape plants with fresh water before and after use
Wet & Forget Ready To Use Outdoor Cleaner comes with a high-capacity trigger sprayer for quick application to smaller surfaces; removes green and black stains caused by moss, mold, mildew, and algae, no scrubbing, no rinsing, no pressure washing, just wet it and forget it on multiple surfaces includ
Key specs
- Spot Coverage
- 60 to 180 sq ft per 64 oz container
- Target Applications
- Ideal for smaller concrete areas such as porch steps, fountains, planters, and walkways where hooking up a hose or pressure washer is impractical.
Pros:
- Included high-capacity trigger sprayer is ready for spot treatments immediately
- Non-acidic and bleach-free chemistry is safe for decorative concrete and planters
- Works without scrubbing, pressure washing, or post-application water rinsing
Cons:
- Limited coverage of 60 to 180 square feet makes it unsuitable for large driveways
- Stain removal relies on rain and weather over 1 to 2 weeks rather than immediate action
CLEANS STAINS CAUSED BY ORGANIC GROWTH: 30 SECONDS Outdoor Cleaner rapid cleans stains caused by algae, mold, mildew and mossSafe For Lawn and Plants: When used as directed, 30 Seconds Outdoor Cleaner will not harm your lawn, trees, shrubs, or landscaping.EASY TO USE: Just spray on to the surface yo
Key specs
- Rinse Requirement
- Direct hose rinse required, no pressure washer needed
- Pack Configuration
- Two 64 fl oz bottles with hose-end attachment
Pros:
- Fast-acting formula lets you spray on concrete and simply hose off
- Hose-end sprayer connects straight to a garden hose without premixing
- Comes in a two-pack providing 128 total fluid ounces of cleaning solution
- Will not harm lawns or landscaping plants when used according to directions
Cons:
- Requires immediate rinsing with a garden hose after application
- Must be hooked up to an outdoor water spigot and garden hose to dispense
CLEANS AND BRIGHTENS IN MINUTES: Microban Outdoor Surface Care removes mold, mildew and algae stains with visible results in minutes. Your exterior surfaces will look bright and new – no ladder or scrubbing required.FOAMING ACTION: clings to surfaces and lifts away dirt, debris, and stubborn stains
Key specs
- Foam Dwell Action
- Microban foaming cleaner clings directly to vertical and flat concrete surfaces, requiring 10 minutes of dwell time before rinsing off with water.
- Vegetation Safety
- Safe for grass, shrubs, and trees when used as directed
Pros:
- Foaming formula clings to concrete and masonry to break down algae stains
- Treats up to 4,500 square feet using the wide spray pattern
- Cleans with visible results after a 10-minute dwell time
- Safe for surrounding lawns, shrubs, and trees when used as directed
Cons:
- Requires a full hose rinse after the 10-minute wait period
- Dispenser requires connection to an active garden hose line
MOSS and ALGAE KILLER and CLEANER: Kills moss, algae, lichen, mold, and mildew wherever it grows and protects for months2-in-1 KILLER and CLEANER: Use on lawns, patios, roofs, buildings, decks, driveways, mulch, and moreKILLS WITHIN HOURS: Moss will quickly turn yellow and then brown, but must be ph
Key specs
- Formula Chemistry
- Non-bleach moss and algae killer
- Post-Treatment Care
- BioAdvanced kills moss and algae within hours, but dead plant residue must be physically swept, brushed, or washed off concrete surfaces afterward.
Pros:
- Non-bleach formula kills algae, moss, and lichen within hours of contact
- Ready-to-spray container hooks up to a hose without manual measuring
- Protects concrete, patios, and driveways against regrowth for months
- Safe for application around lawns without staining or killing grass
Cons:
- Dead moss and thick growth must be physically swept or rinsed away once dead
- Covers up to 500 square feet, which is limited compared to larger jugs
ELIMINATE OUTDOOR STAINS: Green Gobbler Outdoor Cleaner helps remove stains from algae, mold, mildew, dirt and grime. It works wonders to clean and brighten patios, porches, siding, outdoor furniture, flower pots, driveways, sidewalks, decks, fences, roofs and more.MULTIPLE BENEFITS: Not only does t
Key specs
- Eco Profile
- Phosphate-free and VOC-free chemistry
- Naturally breaks down once rinsed into soil
- Safe for landscaping when used as directed
- Surface Prep Use
- Prepares concrete for painting, staining, or sealing
Pros:
- Hose-end sprayer provides second-story reach without needing a pressure washer
- Phosphate-free and VOC-free formula naturally breaks down once rinsed into soil
- Cleans and preps concrete patios and walkways for subsequent sealing or staining
- Fast spray-on and hose-off process eliminates manual scrubbing
Cons:
- Must be rinsed off with a garden hose rather than left to dry
- Requires continuous outdoor water pressure to maintain spraying distance
Last update on 2025-05-20 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API
Pros
- Effortless Cleaning: No scrubbing, rinsing, or pressure washing required. Just spray and let the product do the work with nature's help. This simplicity makes it ideal for people who want an easy, no-hassle solution for cleaning stubborn outdoor stains.
- Versatile Application: Works across multiple surfaces, including driveway, patio, roof, siding, deck, vinyl, wood, concrete, canvas, aluminum, and upholstery. This wide range of applications ensures that it's a go-to cleaner for almost any outdoor cleaning task.
- Long-Lasting Results: One of its standout features is the ability to keep surfaces clean for up to a year or even longer, providing excellent value. After using Wet & Forget, you won't have to worry about frequent reapplications.
- Rain-Activated: Once applied, it cleans surfaces with the power of wind and rain, making it incredibly low-maintenance. After spraying, nature takes over to gradually remove stains, making it highly effective for those who prefer a hands-off cleaning method.
- User-Friendly: Mixing it is simple—just combine 1 part Wet & Forget with 5 parts water and spray. It's easy to store the mixed product in a sprayer for future use, which is a convenience factor for those who don't want to prepare a new batch each time.
- Environmentally Friendly: Wet & Forget is not just effective but also environmentally safe. It avoids harsh chemicals or toxic residues, making it a great option for homes, gardens, and areas with pets and children.
Cons
- Slow Acting: While it’s a hands-off solution, the time it takes for the product to work can be a downside. Green stains can clear up in 1-2 weeks, but stubborn black stains or long-established ones may take months or even up to a year to completely vanish. Patience is required for optimal results.
- Weather Dependent: The product must be applied on dry surfaces with no rain in the forecast for at least 4-5 hours. This can be inconvenient for those in areas with unpredictable weather, as it requires some planning to apply the cleaner effectively.
- Limited Effectiveness on Deeply Stubborn Stains: While Wet & Forget can tackle moss, mold, mildew, and algae, it may struggle with extremely heavy stains, especially those that have been allowed to sit for years. Some stains may require multiple applications.
- Temperature Constraints: It needs to be applied when the temperature is above 32° F, which limits its usability during colder months. Users in regions with frequent low temperatures might find this limiting during the winter season.
- Not Instant Gratification: For people who are looking for an immediate cleaning solution, Wet & Forget’s delayed results can be a drawback. It relies on natural elements like rain and wind to clean, which means you won't see instant results, making it less ideal for those in a rush.
Pros
- Instant Results: One of the standout features of the Home Armor Power Clean Wand is its ability to provide visible results in seconds. Unlike traditional cleaners that require time to work, this product immediately shows its effectiveness, making it a great choice for people looking to tackle tough stains quickly.
- Powerful Cleaning Performance: With 2X cleaning power compared to ordinary outdoor cleaners, it easily removes mold, mildew, algae, dirt, and grime. This powerful cleaning action makes it suitable for even the most stubborn stains.
- User-Friendly: The system is designed for convenience. It combines super-concentrated cleaning tablets with an easy-to-use cartridge refill system, eliminating the need for complicated mixing or messy handling. Users simply insert the cartridge and start cleaning.
- Multi-Surface Versatility: The cleaner is effective on a variety of surfaces, including wood, composite, brick, concrete, vinyl siding, decks, driveways, fences, gutters, shutters, gates, pavers, sidewalks, and patios. Its ability to work on multiple materials makes it a great all-in-one solution for homeowners.
- No Scrubbing Required: Unlike many outdoor cleaners, which often require significant scrubbing and elbow grease, the Home Armor Power Clean Wand works with minimal effort. This feature is perfect for those who don’t want to spend hours cleaning their outdoor spaces.
- Reusable Wand: The wand itself is reusable, meaning you don't have to keep buying new equipment. Simply replace the cleaning cartridges and continue using the wand, offering long-term value.
Cons
- Single Use Cartridges: While the wand itself is reusable, the cleaning cartridges are single-use only. This can be inconvenient for those who need to clean large areas or multiple surfaces, as they will need to purchase additional cartridges regularly.
- Requires Protective Gear: For safety, it’s recommended to wear eye protection and rubber gloves while using the product. This can be a hassle for users who want a completely hassle-free cleaning experience.
- Outdoor Use Only: The product is designed for outdoor spaces only, which means it can’t be used on indoor surfaces. This limits its versatility for those looking for a multi-purpose cleaner for both indoor and outdoor use.
- Limited Storage Options: After use, it’s important to store the wand and cartridges in a cool, dry, well-ventilated place. Users without sufficient storage space might find this a bit of an inconvenience.
- Not Refillable: The cartridges cannot be refilled, which is not the most eco-friendly option. It also means that users will need to buy new cartridges frequently, leading to additional long-term costs.
- Can’t Tackle Deep Set Stains Immediately: While it works wonders on surface-level grime and stains, deeply embedded stains may require multiple applications for complete removal, which can be frustrating for users who expect instant perfection.
Pros
- Quick and Easy Cleaning: With Mold Armor’s E-Z House Wash, cleaning your surfaces is a breeze. The cleaner blasts away dirt, mold, and algae stains in minutes—no scrubbing or ladder required. Just spray, wait 10 minutes, and rinse. The convenience is perfect for homeowners who don’t want to spend hours battling stubborn stains.
- Impressive Coverage: One 64-ounce bottle cleans up to 4,500 sq. ft., offering fantastic value for the price. This makes it ideal for large properties or extensive outdoor surfaces, ensuring you can cover more ground with less effort.
- Microban Foaming Technology: The inclusion of Microban foaming technology is a standout feature. It lifts dirt and debris while adhering to surfaces for a long-lasting clean, ensuring that the stain removal lasts longer than with traditional cleaners. This added durability makes Mold Armor an efficient cleaner that goes the extra mile.
- Versatile Application: Whether you’re cleaning vinyl, brick, stucco, aluminum, concrete, painted wood, trim, PVC, plastic, masonry, or gutters, Mold Armor E-Z House Wash works across a wide range of materials. It’s versatile enough to handle various exterior surfaces, making it a one-size-fits-all solution for most homes.
- No Scrubbing Necessary: Thanks to the formula's ability to cling to surfaces and break down stains, there’s no need to scrub. This is a huge time-saver and ensures that even the most stubborn grime won’t require elbow grease.
- Safe and Efficient: The cleaner is safe to use on various surfaces and doesn’t require harsh chemicals or abrasive scrubbing, which can damage materials. It’s an efficient yet gentle solution that keeps your surfaces safe from harm while delivering a pristine clean.
Cons
- Rinsing Required: While this product does most of the heavy lifting by itself, rinsing is still necessary after application. For some, the need to rinse the cleaner off can be an added step that detracts from the otherwise easy cleaning process.
- Effectiveness on Heavy Stains: While Mold Armor is effective on many stains, extremely tough or deeply rooted stains may need more than one application to fully remove. This might be frustrating for users hoping for immediate results, especially with long-established stains.
- Limited to Outdoor Use: The product is specifically designed for outdoor use. While this makes it perfect for exterior cleaning, it does limit its versatility for those looking for a multi-purpose cleaner for both indoor and outdoor spaces.
- Not a One-Time Use: Although it’s easy to apply, users may find themselves needing to apply the cleaner multiple times for certain heavily stained or neglected areas. This can require extra time and effort, especially if you have larger outdoor areas to clean.
- Requires Hose-End Adapter: The product comes with a hose-end adapter for application, which is convenient for those with garden hoses but can be a hassle for users without the right setup or those who prefer a more hands-on approach to cleaning.
- Potential Over-Spray: While the formula sticks to surfaces for an extended period, overspray can be an issue if you're not careful. Users need to ensure they cover only the areas they want to clean, or else the product may get onto nearby plants or furniture, causing possible damage.
Pros
- Instant Results: The fast-acting formula of RMR-86 begins working immediately, making it ideal for those looking to get rid of stubborn mold and mildew stains without delay. You won’t have to wait hours or days for results, as the product starts eliminating stains right before your eyes.
- No Scrubbing Required: One of the best features of this cleaner is that there’s no scrubbing required. You simply spray it on the affected area, and it does the hard work for you. This makes it an excellent choice for people who want to save time and energy, especially for large areas or those who have trouble with scrubbing.
- Professional Strength: RMR-86 is a professional-strength cleaner that’s specifically formulated to eliminate deep-rooted stains caused by mold and mildew. It works wonders on stains that go beyond the surface, tackling even the toughest discoloration.
- Versatile Usage: You can use it on a variety of surfaces, including wood, vinyl siding, drywall, concrete, brick, and kitchen surfaces. Whether you’re dealing with mold in your bathroom, on your deck, or on concrete floors, this cleaner gets the job done without damage.
- Safe for Indoor Use: While it’s a powerful mold and mildew stain remover, RMR-86 is safe to use indoors with proper ventilation and personal protective equipment (PPE). This makes it a convenient choice for those dealing with mold in areas like kitchens, basements, or bathrooms.
- Odor Control: The product not only removes stains but also helps eliminate odors associated with mold and mildew, ensuring that your space smells fresh after cleaning.
Cons
- Strong Chemical Odor: While it’s effective, the strong chemical scent can be overwhelming. Users are advised to use proper ventilation, and PPE, which can be a bit of a hassle for those who prefer low-odor or more natural cleaning options.
- Requires PPE for Safety: For safety, personal protective equipment (PPE) such as gloves and a mask are required during use. This extra step may be inconvenient for those who are looking for a completely hassle-free cleaning experience.
- Not Eco-Friendly: As a professional-strength cleaner, RMR-86 is not the most eco-friendly option. Those who are looking for more sustainable or non-toxic cleaning products might find this to be a drawback.
- Not for All Surfaces: While the cleaner works on a variety of surfaces, it may not be suitable for delicate or painted surfaces. Always check the label to ensure that it’s safe to use on the specific surface you plan to clean.
- Multiple Applications Needed: For deeply embedded mold and mildew stains, multiple applications might be necessary. If the stains are particularly old or extensive, users might need to apply the product more than once for complete removal.
- Not a Preventative Solution: RMR-86 is great for removing existing mold and mildew stains, but it doesn’t offer long-term protection. If you’re looking for a cleaner that will also prevent future mold growth, you may need to combine it with a mold-resistant product or take additional steps.
Pros
- Powerful Grime Removal: One of the standout features of Simple Green Oxy Solve is its impressive ability to clean a wide range of stains, including oil stains, rust, grease, tire marks, and even automotive fluids. It tackles some of the toughest stains you can find on driveways, patios, and walkways. The cleaner is particularly effective for anyone dealing with years of dirt and grime build-up.
- Eco-Friendly Formula: Utilizing the power of peroxide, Simple Green Oxy Solve offers an environmentally conscious solution to outdoor cleaning. Unlike some harsh chemical-based cleaners, this formula works by lifting dirt and stains without relying on harmful or toxic ingredients, making it a safer choice for those conscious of their environmental footprint.
- Versatile Application: The cleaner is designed for a variety of surfaces, including concrete, driveways, walkways, patios, and even masonry. This broad range of uses makes it a one-stop solution for cleaning multiple outdoor areas, saving you the trouble of purchasing different cleaners for different surfaces.
- Convenient and Effective: The formula is unscented, which is a great feature for people who are sensitive to strong odors. Plus, it’s easy to use with a pressure washer, allowing for quick application and removal of stains without the need for excessive scrubbing.
- Large Quantity for Value: With a 128 fl. oz. container, you get plenty of cleaner for your money, making it an excellent option for large-scale cleaning tasks like driveway or patio restorations. This generous amount ensures you can tackle multiple projects without running out halfway through.
- Non-Harmful to Surfaces: Unlike many heavy-duty cleaners that can damage surfaces over time, Simple Green Oxy Solve is safe for a wide variety of materials. It won't cause discoloration or degradation, which makes it a reliable choice for those who want to maintain the appearance and longevity of their surfaces.
Cons
- Container Size May Be Overkill for Small Jobs: While the 128 fl. oz. bottle is fantastic for large cleaning tasks, it might be too much for smaller areas or occasional use. This could lead to wasted product if you don’t have significant cleaning to do or only need it for light spot treatments.
- Not Instantaneous: Despite being an effective cleaner, the product may not offer immediate results for all stains. Some heavy oil or grease stains might require multiple applications or additional time to fully break down, which could be a drawback for users hoping for quick and easy results.
- Requires Pressure Washer for Best Results: The cleaner is designed to be used with a pressure washer, which means it might not be the best choice for those who don't own one or prefer manual cleaning. If you’re without this equipment, the cleaner might not perform as well as expected.
- Potential for Over-Spray: When using a pressure washer, users need to be cautious of overspray, especially in areas where you don’t want the cleaner to go. It’s easy to unintentionally clean areas like plants, windows, or nearby surfaces, so you’ll need to be careful during application.
- Inconsistent Packaging: The product's container may vary from the image shown, which could be an issue for customers expecting a certain kind of packaging. Though this doesn’t affect the performance of the cleaner, it could cause confusion or disappointment when it arrives.
- Limited to Outdoor Use: While the cleaner excels at tackling outdoor stains, it’s not a multi-purpose cleaner for indoor use. Users hoping for a versatile cleaner that can handle both indoor and outdoor surfaces will need to look elsewhere, as this product is specifically formulated for outdoor cleaning.
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