10 Best Moss And Algae Killer And Cleaner of 2025

Tested and Reviewed: Top 10 Moss And Algae Killer And Cleaner deals with expert ratings from 8.1 to a perfect 10

May 2026 Edition

Editor's Choice

9.7

BioAdvanced

BioAdvanced 2-in-1 Moss and Algae Killer for Lawns, Roofs, Patios, Decks, Roof Moss Killer, Deck Cleaner and Mildew Remover, 32 oz

Editor's bottom line:

“This moss and algae killer and cleaner is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

LAWN MOSS KILLER: Moss turns yellow and then brown, but must be physically removed once dead
2-in-1 KILLER and CLEANER: Use on lawns, patios, roofs, buildings, decks, driveways, mulch, and more
MOSS and ALGAE KILLER and CLEANER: Moss killer for algae, lichen, mold*, and mildew* for protection that lasts for months (*not including species considered public health concerns)
NON-STAINING FORMULA: Non-staining formula will not stain and will wont harm lawns when used as directed
NON-BLEACH FORMULA: BioAdvanced non-bleach formula will not stain or harm lawns

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Picked by 397 people today

9.5

Save 6%

Wet & Forget

Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Outdoor Cleaner Concentrate, Original, 128 Fluid Ounces

6% Off

Main Highlights

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 forget
Surfaces including driveway, patio, roof, siding, deck, vinyl, wood, concrete, canvas, aluminum, and upholstery
Mix 1 part Wet & Forget with 5 parts water in a garden sprayer, spray dry surface on a cool day to avoid rapid evaporation of product, do not rinse, apply when rain is not forecasted within 4-5 hours
Apply when the temperature is above 32° F; unused product can be stored mixed and ready in sprayer for future applications
Cleans with the wind and rain, green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months, long-established stains may take 6-12 months; surfaces can stay clean up to 1 year or longer

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Best Value

9.5

Save 21%

Wet & Forget

Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Xtreme Reach Hose End with New & Improved Nozzle, 48 Fluid Ounces

21% Off

Main Highlights

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 rinsing
Spray dry surface on a cool day to avoid rapid evaporation of product, do not rinse, apply when rain is not forecasted within 4-5 hours, apply when the temperature is above 55° F
Cleans over time with the wind and rain, green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months, long-established stains may take 6-12 months; surfaces can stay clean up to 1 year or longer
It is bleach free and non-acidic; spray 100 feet away from lakes, ponds, rivers, and streams and flush plants with water before and after application
Each bottle treats up to 2,000 square feet, heavy stained and porous surfaces will absorb more product

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9.2

30 SECONDS

30 Seconds Outdoor Cleaner | Cleans Moss & Algae Stains from House, Vinyl Siding, Deck, Patio, Fence - 3 Capped Bottles, 1 Hose End Spray Attachment (64 Fl Oz (Pack of 3)

Main Highlights

CLEANS STAINS CAUSED BY ORGANIC GROWTH: 30 SECONDS Outdoor Cleaner rapid cleans stains caused by algae, mold, mildew and moss
SAFE: Lawns and plants when used as directed, 30 SECONDS Outdoor Cleaner will not harm your lawn, trees, shrubs or landscaping
Effective on Multiple Surfaces: Works great on wood decks, concrete sidewalks, asphalt driveways, brick walls, most canvas awnings, plastic outdoor furniture, vinyl siding & more
Easy To Use for Outdoor Cleaning: Follow instructions on product label to attach hose end sprayer to refill bottle. Then, just spray on to the surface you would like to clean and hose off! No more pressure washing needed!

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9.0

Save 9%

Scotts

Scotts MossEx 3-in-1 Ready Spray, Kills Moss, Algae and Lichens, Fast Acting, Use on Lawns, Roofs, and Patios, 32 fl. oz.

9% Off

Main Highlights

Scotts MossEx 3-in-1 Ready-Spray is a fast and effective way to control moss, algae, lichens, and liverworts
This fast-acting liquid formula kills within hours and does not stain concrete or other surfaces
Use this moss control product any time during the year by connecting the sprayer to a garden hose and spraying
For use on lawns, ornamental gardens, around homes and on roofs, patios, decks, sidewalks, and more (as listed)
One 32 fl.oz. container of Scotts MossEx 3-in-1 Ready Spray treats up to 500 sq. ft.

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8.8

Save 19%

Safer

Safer Brand 5324-6 Moss and Algae Killer and Surface Cleaner, 32 oz. Hose Sprayer

19% Off

Main Highlights

This moss and algae killer utilizes the effectiveness of potassium salts to rid your deck, roof, siding, walkways, lawn and more of algae and moss
Ready-to-use formula attaches directly to your hose for an economical and convenient solution
Kills algae and mosses
OMRI listed for organic use

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8.6

30 SECONDS

30 SECONDS Outdoor Cleaner 2 Pack with Hose End Sprayer - Cleans Stains from Algae, Mold and Mildew on Vinyl Siding, Deck, Patio, Brick and More

Main Highlights

CLEANS STAINS CAUSED BY ORGANIC GROWTH: 30 SECONDS Outdoor Cleaner rapid cleans stains caused by algae, mold, mildew and moss
Safe 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 you would like to clean and hose off! No more pressure washing
EFFECTIVE FOR MULTIPLE SURFACES: Works great on wood decks, concrete sidewalks, asphalt driveways, brick walls, most canvas awnings, plastic outdoor furniture, vinyl siding & more!

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8.3

Save 2%

BioAdvanced

BioAdvanced 2-in-1 Moss and Algae Killer and Cleaner, Ready-to-Spray, 32 oz with BioAdvanced Fungus Control for Lawns, Ready-to-Spray, 32 oz

2% Off

Main Highlights

MOSS and ALGAE KILLER and CLEANER: Kills moss, algae, lichen, mold, and mildew wherever it grows and protects for months
2-in-1 KILLER and CLEANER: Use on lawns, patios, roofs, buildings, decks, driveways, mulch, and more. KILLS WITHIN HOURS: Moss will quickly turn yellow and then brown, but must be physically removed once dead
NON-BLEACH FORMULA: BioAdvanced non-bleach formula will not stain or harm lawns
FUNGUS CONTROL: Fungus control for lawns cures and prevents listed lawn diseases
DISEASE CONTROL: Fungicide controls red thread, brown patch, dollar spot, rust, and other listed diseases
RAINPROOF PROTECTION: Systemic fungicide is absorbed by grass and will not wash off

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8.1

30 SECONDS

30 SECONDS Outdoor Mold & Mildew Stain Remover Spray | Ready To Use | 32 fl. oz. | 2 Pack

Main Highlights

REMOVES STAINS FROM ORGANIC GROWTH ON YOUR OUTDOOR SURFACES: 30 SECONDS Outdoor cleaner rapidly cleans stains from algae, mold, mildew, dirt and grime
EASY DIY HOME IMPROVEMENT: No pressure washing or mixing required! Simply follow the instructions to use the motorized sprayer included and youre ready to make your home more beautiful
IMMEDIATE RESULTS ON A VARIETY OF OUTDOOR SURFACES: Works on many outdoor surfaces including decks, composite and stained surfaces. Concrete, bricks and masonry. Gutters, siding, canvas, plastic and stucco. Fences, arbors and painted surfaces. You can see results immediately!
PLANT AND LAWN SAFE: When used as directed, 30 SECONDS outdoor cleaner is safe to use around landscaping, plants, and your lawn. The formula breaks down once rinsed into the soil.
PROUDLY MADE IN AMERICA: All 30 SECONDS products are manufactured in the USA using US and imported parts

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Our Best Overall Choice

Best Choice

9.7

BioAdvanced

BioAdvanced 2-in-1 Moss and Algae Killer for Lawns, Roofs, Patios, Decks, Roof Moss Killer, Deck Cleaner and Mildew Remover, 32 oz

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

LAWN MOSS KILLER: Moss turns yellow and then brown, but must be physically removed once dead
2-in-1 KILLER and CLEANER: Use on lawns, patios, roofs, buildings, decks, driveways, mulch, and more
MOSS and ALGAE KILLER and CLEANER: Moss killer for algae, lichen, mold*, and mildew* for protection that lasts for months (*not including species considered public health concerns)
NON-STAINING FORMULA: Non-staining formula will not stain and will wont harm lawns when used as directed
NON-BLEACH FORMULA: BioAdvanced non-bleach formula will not stain or harm lawns

Show Price

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