Life's Dirty. Clean Easy.

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Wet & Forget Concentrate is a different dilution rate than Wet & Forget Xtreme Reach™ Hose End, it cannot be used as a refill for the hose end.

Wet & Forget Concentrate

Moss, Mold, Mildew & Algae Stain Remover

Are you tired of the never-ending cycle of cleaning black and green stains from your home? Introducing the easiest solution for eliminating these issues without using elbow grease or harsh chemicals—Wet & Forget Outdoor Cleaner! Simply spray and walk away! That's it. Wet & Forget goes to work with the wind and rain to gently clean the surface over time.

  • Easy Spray & Leave Application
  • No Scrubbing, Rinsing or Pressure Washing
  • Bleach-free, Phosphate-free and Non-acidic
  • Surfaces Stay Clean 1+ Years in Most Cases
  • Safe for Virtually Any Outdoor Surface

Wet & Forget Works. See for Yourselves.

Wet & Forget's gentle cleaning action uses the wind and rain to continue working overtime; it keeps ugly stains at bay for a year or more on most surfaces.

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See Wet & Forget Outdoor in Action

Applying Wet & Forget is quick and easy. Just mix with water and apply with a tank sprayer. That's it! Wet & Forget goes to work on contact cleaning the surface. Check out our video on how to mix Wet & Forget along with a few applications to different surfaces. Wet & Forget has an unlimited shelf life, and it can be safely stored pre-mixed in the sprayer until your next application!

Don’t let black and green algae take over the outside of your home! Find out how to treat algae with one simple step.

Got lichen? Don’t fret! Learn how to apply Wet & Forget to treat tough lichen.

See how Jim N. used Wet & Forget to easily clean up moss around his cabin.

Where Can I Use Wet & Forget Outdoor?

Bleach and many other outdoor cleaners are highly caustic and can potentially corrode and discolor outdoor surfaces. Wet & Forget's gentle, nearly pH-neutral formula is bleach-free and safe to use on virtually any outdoor surface.

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Benefits of using Wet & Forget Outdoor Cleaner
  • Bleach-free, non-acidic and phosphate-free.
  • 1-Gallon container makes 6-Gallons!
  • Requires no scrubbing, no rinsing, and no pressure washing.
  • Conserves water.
  • Safe for virtually any outdoor surface.
  • One-step application: Simply spray and walk away!
  • Eliminates even the toughest cases of moss, algae, lichen, mold or mildew.
  • Long-lasting: Keeps the surface clean for at least 1+ years in most cases.
  • Wet & Forget is an EPA registered product. Many products on the market are not.
  • Bio-degradable.
  • Unlimited shelf life.
  • Safe to store in the sprayer after mixed.
  • Wet & Forget Outdoor has a pH level of 8, while pure water has a pH of 7. Most products on the market have a pH level of 10-13, which is 100 – 10,000 times more alkyl than Wet & Forget Outdoor.

Application & Tips

Wet & Forget outdoor concentrate fill garden sprayer with water to
2 1/2 cups (20 oz.) 1 gallon mark
5 cups (40 oz.) 2 gallon mark

Application: Apply Wet & Forget Outdoor to a DRY outdoor surface until thoroughly saturated. Wet & Forget is best applied in cool, dry conditions to avoid evaporation. Do not use if rain is in the forecast within 4-5 hours. Avoid application during the warmest part of the day or hot days, to avoid evaporation which can diminish results. Temperatures need to be above 32 degrees during application and for approximately 5 hours after.

Reaction Time: Once treated with Wet & Forget, green growths such as algae will clean up within a few days or weeks in most cases. Black stains caused by mold and mildew can take a month, sometimes several months. Worse-case scenario, heavy black stains that have built-up for many years can take six months - 1 year to come clean. Be Patient. Good Things Take Time.

You'll never have to wait for results after your first initial cleaning; you'll move to an annual maintenance application to keep those surfaces mold-free.

Maintenance: Repeat application once a year or at the first sign of new moss, mold, mildew or algae growth.

Treating Moss: To get rid of moss, thoroughly saturate the moss making sure the Wet & Forget Outdoor soaks through and comes in contact with the surface the moss has attached itself to. Over the next few days or weeks, you'll notice the moss turning brown, curling up and detaching from the surface. The wind and rain will help wash away any remaining moss.

Treating Lichen: Lichen is a complex combination of fungus and algae that have learned to live together, forming a unique type of growth. Lichen can cause pitting on outdoor surfaces. The symbiotic relationship between the fungus and algae makes lichen very hardy and difficult to get rid of. But don't worry--even this robust growth is no match for Wet & Forget Outdoor. Use a garden sprayer to thoroughly saturate the lichen with a solution of 1 part Wet & Forget Outdoor and 5 parts water. Wait 15 minutes, and spray a second time. The outer shell will soften during this time so Wet & Forget can penetrate the lichen's inner layer. It is best to spray lichen on a day that is not too sunny, to prevent rapid evaporation and to allow Wet & Forget more time to work.

Check out our FAQ's or Blog for additional information.

Active Ingredients

Alkyl dimethyl benzyl ammonium chloride 9.9%


Blue dye -- Withheld -- Colorant

Where To Use Wet & Forget Outdoor

Wet & Forget is non-acidic and contains no bleach; therefore it can be used on ANY outdoor surface material. Some of the more popular surfaces include: Roofs, Siding, Decks, Walkways, Driveways, Brick, RVs, and Boats.

For large surfaces and high elevations, we suggest using our Wet & Forget Outdoor Hose End which reaches areas up to 30', perfect for roof cleaning.

Exterior Home Surfaces: Covered Porches, Decks (All types), Downspouts, Driveways, Eaves, Gutters, Patios (All types), Pavers, Roofs (All types), Screens, Shingles (All types), Sidewalks, Siding (All types), Steps

Lawn & Garden: Awnings, Diving Boards, Fences (All types), Fountains, Gazebos, Greenhouses, Hammocks, Lanais, Lawn & Patio Furniture (All types), Outdoor Mats/Rugs, Outdoor Pots, Patio Umbrellas, Plastic Playhouses, Play Equipment, Pool Liners, Pool Surrounds, Retaining Walls, Shade Sails, Storage Units

Marine: Aluminum, Boat Bilges, Boats, Boat Carpeting, Boat Seats, Canvas, Fiberglass, Inflatable Boats, Sails, Teak

Camping: Cabins, Outdoor Furniture, Pop-Up Campers, RVs

Other: AstroTurf, Basketball Courts, Cars & Trucks, Log Homes, Monuments, Tennis Courts, Tombstones

Materials: Aluminum, Asphalt, Brick, Cement, Ceramic, Clay, Composite, Concrete, Dryvit/EIFS, Fabric, Fiberglass, Flagstone, Limestone, Marble, Metal, Natural, Painted, & Stained Wood, Painted Surfaces, Plastic, PVC, Rubber, Sandstone, Slate, Steel, Stone, Stucco, Teak, Textured Surfaces, Tiles, Tin, Vinyl

Commercial: Airports, Amusement Parks, Cemeteries, Freeways, Hospitals, Hotels & Motels, Parks, Public Buildings, Schools, Stadiums, Zoos...

and virtually any other surface you can think of!