10 Best Wet & Forget Mould Lichen & Algae Remover Outdoor Patio Cleaner of 2025

Tested and Reviewed: Top 10 Wet & Forget Mould Lichen & Algae Remover Outdoor Patio Cleaner deals with expert ratings from 8.1 to a perfect 10

May 2026 Edition

Editor's Choice

9.7

Wet & Forget

Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Ready to Use, 64 Ounce

Editor's bottom line:

“This wet & forget mould lichen & algae remover outdoor patio cleaner is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

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 including, porch steps, headstones, fountains, planters, concrete, canvas, and upholstery
Use attached sprayer apply generously to 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
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 60 to 180 square feet; heavy stained and porous surfaces will absorb more product

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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 19%

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

19% 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

Wet & Forget

Wet & Forget Outdoor Stain Remover Multi-Surface Cleaner, Xtreme Reach Hose End with New & Improved Nozzle, 48 Fluid Ounces, 1 Pack + Refill

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

Show Price

9.0

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 it on multiple 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 with unlimited shelf life
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
One bottle treats 750 - 2,250 square feet, heavy stained and porous surfaces will absorb more product

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8.8

Save 5%

Wet & Forget

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

5% Off

Main Highlights

Wet & Forget Xtreme Reach Hose End Refill Outdoor Cleaner using original nozzle 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 2nd story siding; fan tip provides quick application to large surfaces driveways, patios and decks; no scrubbing, no rinsing, and no pressure washing, just wet it and forget it
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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8.6

Wet & Forget

Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Outdoor Cleaner Concentrate, Original, 64 Fluid Ounces

Main Highlights

Concentrate outdoor cleaner removes stains caused by moss, mold, mildew, and algae with no scrubbing or rinsing, just wet it and forget it for hard, sealed non-porous surface including driveway, patio, roof, siding, deck, vinyl, wood, sealed concrete, canvas, aluminum, and upholstery
Dilute 1 part Outdoor to 5 parts water, apply with a garden sprayer generously to a dry, debris-free surface in mild climate, do not rinse or apply when rain is expected 4-5 hours after application; unused solution can be stored in sprayer for next use
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
One bottle treats 375 - 1,125 square feet, heavy stained and porous surfaces will absorb more product

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8.3

Wet & Forget

Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Outdoor Cleaner Concentrate, Original, 64 Fluid Ounces (2 Pack)

Main Highlights

Concentrate outdoor cleaner removes stains caused by moss, mold, mildew, with no scrubbing or rinsing just wet it and forget it for hard, sealed non-porous surface including driveway, patio, roof, siding, deck, sealed concrete, and more
Dilute 1 part concentrate to 5 parts water and apply with a garden sprayer generously to a dry, debris-free surface in mild temperatures, do not rinse or apply when rain is expected within 4-5 hours of application; unused portion can stored for next use
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 but spray 100 feet away from any water source and flush plants with water before and after application; includes 2 x 0.5 gallons concentrate which make 2 x 3.0 gallons
Includes 2 x 0.5 gallons concentrate which make 2 x 3.0 gallons of cleaner, has an unlimited shelf life, and results last for a minimum of 1 year
One bottle treats 375 - 1,125 square feet, heavy stained and porous surfaces will absorb more product

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8.1

Wet & Forget

Wet & Forget Outdoor Moss Mold Mildew & Algae Stain Remover 2x .75 Gallon

Main Highlights

Concentrate outdoor cleaner removes stains caused by moss, mold, mildew, and algae with no scrubbing or rinsing, just wet it and forget it for surfaces including driveway, patio, roof, siding, deck, vinyl, wood, sealed concrete, canvas, aluminum, and upholstery
Dilute 1 part Wet & Forget Outdoor to 5 parts water and apply with a garden sprayer generously to a dry, debris-free surface in mild temperatures, do not rinse or apply when rain is expected within 4-5 hours of application; unused solution can be stored mixed and ready in sprayer for future applications
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 any water source and flush plants with water before and after application
Will treat approximately 1,100-3,400 square feet depending on surface, has an unlimited shelf life, and results last for a minimum of 1 year

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8.1

Wet & Forget

Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Ready to Use, 64 Fluid Ounces, 4 Pack

Main Highlights

Wet & Forget Ready To Use Outdoor Cleaner 4 pack 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 including, porch steps, headstones, fountains, planters, concrete, canvas, and upholstery
Use attached sprayer apply generously to 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
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
Includes 4 - 64 Fl. Oz bottles of cleaner with unlimited shelf life; one bottle treats 60 - 180 square feet, heavy stained and porous surfaces will absorb more product

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Our Best Overall Choice

Best Choice

9.7

Wet & Forget

Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner, Ready to Use, 64 Ounce

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

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 including, porch steps, headstones, fountains, planters, concrete, canvas, and upholstery
Use attached sprayer apply generously to 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
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 60 to 180 square feet; heavy stained and porous surfaces will absorb more product

Show Price

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