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

4.4 4.4 out of 5 stars 9,708 ratings
List Price: $59.99 Details

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128 Fluid Ounces
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Purchase options and add-ons

Brand Wet & Forget
Item Weight 8.35 Pounds
Liquid Volume 128 Fluid Ounces
Item Form Liquid
Coverage 750 - 2,250 square feet

About this item

  • 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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From the manufacturer

wet and forget outdoor
wet and forget concentrate

FEATURES

Any Surface

Coverage

no power washing

No scrubbing

Use Wet And Forget To Clean

fence

Deck

stone

stone

Hose End Hose Refill concentrate Concentrate Ready To Use
BUY BUY BUY BUY BUY
See Details
Customer Reviews
4.1 out of 5 stars
112
4.4 out of 5 stars
914
4.3 out of 5 stars
5,440
4.4 out of 5 stars
9,708
4.0 out of 5 stars
12,824
Price — $33.97 $29.92 $30.70 $20.64
Application Method Hose Refill for Hose End Pump Sprayer Pump Sprayer Trigger Sprayer
Coverage Covers up to 2,000 sq ft Covers up to 2,000 sq ft Covers 375 - 1,125 sq ft Covers 750 - 2,250 sq ft Covers 60 - 180 sq ft
Where to use Safe for use on virtually any outdoor surface Safe for use on virtually any outdoor surface Safe for use on virtually any outdoor surface Safe for use on virtually any outdoor surface Safe for use on virtually any outdoor surface
What to expect Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months. Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months. Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months. Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months. Green stains clean up within 1-2 weeks, black stains or heavy, stubborn stains can take several months.

Product Description

Wet & Forget is an outdoor cleaner that eliminates black and green stains caused by moss, mold, mildew and algae without any scrubbing, power washing or bleach. Just mix 5 parts water with 1 part Wet & Forget in a pump up garden sprayer. Fully saturate a dry surface with Wet & Forget on a cool dry day and leave it. That’s it! Just wet it and forget it. Wet & Forget goes to work with the wind and rain to gently clean the surface over time. Green stains generally clean up within a few weeks, a few days with rainfall. Black stains or heavy stubborn stains may take 6-12 months to fully clean up. Be Patient, Good Things Take Time! Wet & Forget properly cleans surfaces, so they are likely to stay clean up to 1 year or longer. Repeat application yearly or when new stains appear to maintain a clean surface. Wet & Forget contains no bleach and is safe to use on any outdoor surface including any type of deck, siding, roof, walkway, patio, brick, and cement. Gallon Concentrate makes 6-Gallons and covers 750 - 2,250 sq. ft. depending upon severity of the stain and porosity of the surface. Wet & Forget - the easy way to clean all your outdoor surfaces

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ Yes
  • Product Dimensions ‏ : ‎ 6.25 x 4.5 x 10.5 inches; 8.35 Pounds
  • Item model number ‏ : ‎ E800006
  • Department ‏ : ‎ Unisex-Adult
  • Material Feature ‏ : ‎ Biodegradable Warning
  • Date First Available ‏ : ‎ November 1, 2007
  • Manufacturer ‏ : ‎ Wet and Forget
  • ASIN ‏ : ‎ B0019KSUG6
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.4 4.4 out of 5 stars 9,708 ratings

Product guides and documents

User Guide (PDF)

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Price-49% $30.70
List: $59.99		$58.98-6% $27.53
Typical: $29.26		-8% $62.81
List: $67.99
Delivery
—
Get it May 2 - 6
Get it as soon as Friday, May 3
—
Customer Ratings
4.44.4 out of 5 stars9,708
4.44.4 out of 5 stars1,006
3.83.8 out of 5 stars346
4.34.3 out of 5 stars53
Easy to use
4.4
4.7
3.6
5.0
Value for money
3.9
4.0
2.6
4.3
Style
3.9
—
—
5.0
Sold By
Amazon.com
Fat Boy Tools
Amazon.com
Amazon.com
liquid volume
128 fluid ounces
5 gallons
1 gallons
48 fluid ounces
coverage
750 - 2,250 square feet
—
2000 square feet
Up to 2,000 sq. ft.
form
Liquid
Liquid
Liquid
Liquid
weight
8.35 pounds
8.68 pounds
—
—

Important information

Ingredients

Alkyl dimethyl benzyl ammonium chloride

Legal Disclaimer

Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.

Looking for specific info?

Customer reviews

4.4 out of 5 stars
4.4 out of 5
9,708 global ratings

Customers say

Customers like the performance, ease of use, and cleaning of the weed moss control agent. For example, they mention it works great, it's easy to apply, and it gets cleaner with time. That said, some differ on toxicness, value, and mosses control.

AI-generated from the text of customer reviews

1,104 customers mention833 positive271 negative

Customers like the performance of the weed moss control agent. For example, they mention it works great, the results are pretty amazing, and it's the best stuff for problem areas. That said, some say it works slowly over a year and removes the black crud and greatly improves footing.

"...One needs to be patient after using the product. It works slowly over a year...." Read more

"...+ Work great on exterior brick surfaces, like chimneys.+ Advertised - 1 gallon concentrate makes 6 gallons of ready to use product...." Read more

"...No more scrubbing & hosing on a wet slippery metal roof. This stuff really works but you just have to give it time. Thanks for a great product." Read more

"Just be patient, its not bleach so results are not instant. But it works great, and appears to last a long time." Read more

287 customers mention208 positive79 negative

Customers like how easy it is to clean with the product. They say it does not smell bad, does not require scrubbing, and is pet friendly. They also say it cleans moss and mildew from paver landscape walls, keeps fences clean, and allows mold grime to wash off with water. Some customers also mention that it's great for cleaning tombstones and stains from acorns.

"...It works. It keeps fences clean even after 2 years of application. It doesnt seem to attract as much moss, lichen mold etc...." Read more

"...+ Advertised - EPA approved one step process that requires no scrubbing or rinsing.+ Advertised - safe around plants...." Read more

"...Only negative was our Fushia's and rhododendron developed yellow spots on leaves so next time i sprayed i covered with Visqueen." Read more

"...We just spray it on our concrete drive and walk away. It gets cleaner and brighter with time. Did it in the Fall and it worked over the winter." Read more

214 customers mention205 positive9 negative

Customers find the product very easy to apply, with simple mixing and spraying instructions. They also mention that it takes 15 minutes to spray on.

"...The pros:+ VERY easy to apply with a spray bottle or pump sprayer.+ Work great on exterior brick surfaces, like chimneys...." Read more

"...I already had an applicator so it was very easy to apply. Results are still improving. Love this." Read more

"If you have a decent sprayer, this is easy to apply. It works too!" Read more

"...Bought some, easy to mix, easy to put on (used pump sprayer) the siding...." Read more

98 customers mention80 positive18 negative

Customers like the appearance of the weed moss control agent. They say it makes things look new again, and it's easy to maintain that clean look. Some customers also mention that the stones now look like new, and the walls look cleaner. They also say the surface is beautifully natural and creamy white when clean.

"...was almost black, before application, however, now it has a newly laid look...." Read more

"...I did take a bucket of water and a very light scrub and it looks brand new!" Read more

"...it finally does work (a few months later) t it is fairly easy to maintain that clean look if you it apply this stuff regularly -- once a year or so." Read more

"...To my surprise it came out looking brand new! Definitely my new favorite product." Read more

50 customers mention50 positive0 negative

Customers are satisfied with the service provided by the weed moss control agent. They mention that it works quickly, and the battery sprayer is faster. They also appreciate the back and time saver.

"...Battery sprayer is way faster and probably reduces the time by three quarters...." Read more

"Decent price, quick shipping, works great" Read more

"Wet & Forget for OUTSIDE……Arrived quicker than originally stated...." Read more

"Works almost instantly. Sprayed siding (using a pump-up lawn sprayer) having a LOT of green moss on the east side of the house...." Read more

208 customers mention120 positive88 negative

Customers have mixed opinions about the value of the product. Some say it's well worth the money, while others say it’s expensive and a waste of money.

"...Great product, works well, great value, not very well thought out on application." Read more

"...▪ This product is on the expensive side, so I shop around when I need more. The last 2 gallons I purchased cost me $24.97 a gallon at the Home Depot...." Read more

"Decent price, quick shipping, works great" Read more

"...The product is a little pricey, but worth it! I highly recommend it!" Read more

190 customers mention106 positive84 negative

Customers are mixed about the moss control. Some mention it gets rid of the Moss and algae and hasn't come back in 3 months. However, others say that it did not remove mold and mildew as advertised, and that it didn't clear the roof of mosses.

"...I got up on our roof and the green algae is gone!! No more scrubbing & hosing on a wet slippery metal roof...." Read more

"Really heavy mold on my composition roof . As the directions clearly stated it takes a little time to work ...." Read more

"...Within a week, the moss was almost completely gone. Using this product has saved me time and has kept me off the ladder. It is a great product!" Read more

"...over the course of this spring, we noticed that we had a moss problem on 1 large section of our roof (basically the attached 2 car garage)...." Read more

67 customers mention35 positive32 negative

Customers are mixed about the toxicness of the product. Some mention that it does not harm lawns or plants, while others say that it is really deadly to plants and has many health hazards.

"...+ Advertised - safe on any outdoor surface.+ Advertised - one step process... Wet & Forget!..." Read more

"...It actually started eating the moss and mold between cedar shakes, that was actually like a barrier for..." Read more

"...on molded brick wall.. it works slow but it explains why...No Dangerous harsh chemicals! So I can live with that...." Read more

"...Near the end of July, the roof was nearly covered in moss again and I was getting desperate...." Read more

Removes Mildew on Marker Engravings
5 Stars
Removes Mildew on Marker Engravings
I used this years ago on my slate roof and it removed the mildew just like it says. I noticed my family cemetery plot from the 1940's had markers that were so dark with mildew that they were unreadable as the pic shows. I knew this was safe on Stone Markers so I applied it heavy with a soft scrubbing brush and in 3 months the change was remarkable as you could clearly see the names and dates. It was been working over the winter and when it warms I will reapply and they will be good for years. For privacy I will not show the after pictures.
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Top reviews from the United States

Greg Pittas
5.0 out of 5 stars This stuff is great!
Reviewed in the United States on April 23, 2024
Size: 128 Fluid OuncesStyle: RemoverVerified Purchase
Just be patient, its not bleach so results are not instant. But it works great, and appears to last a long time.
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someone
5.0 out of 5 stars Excellent product
Reviewed in the United States on March 29, 2023
Size: 128 Fluid OuncesStyle: RemoverVerified Purchase
I have used this product on driveways, unpainted fences, rock retaining walls, concrete blocks, brick walls unpolished landcape granite stones, paved pathways and composite decks. It cleans so well, that it eliminates need to pressure wash. Concrete Driveway was almost black, before application, however, now it has a newly laid look. I have been using his product near plants (not edible) and have noticed no damage. Yes, its hard to control overspray 100% of time. I love that rain, snow, wind are also the cleaning agents and I dont need to waste any additional water in cleaning. Water is expensive. Rock retaining walls look like newly installed and just made, after using this product. I have had people think 10 year old walls were installed a month ago. I also use it on pebble bed to keep cobblestones looking clean. It works. It keeps fences clean even after 2 years of application. It doesnt seem to attract as much moss, lichen mold etc. It does give it weathered clean light grey/whitish look, which I dont mind. It does NOT give a fresh brown wood look, like if you pressure washed it.
One needs to be patient after using the product. It works slowly over a year. The best time to apply it is dry fall day, so the rains can help with cleaning, not to mention winter snow. After that once a year to year and a half, maintainence is more than enough. And come spring and summer, you can enjoy the cleaner surfaces.

I also used it on cedar roof. I did excellent job with it. However, the roof was old and leaked after this application, requiring me to change the roof. My theory could be a combination of any: 1) It actually started eating the moss and mold between cedar shakes, that was actually like a barrier for water somewhat. my cedar shakes had only 2 to 5 years of life left and potentially cleaning it, reduced its life 2) I walked on roof to apply the product which could have strained old shakes. - There are special shoe fasteners that I overlooked wearing. The house damage was negligible and very promptly addressed, though I wish I didnt have that extra expense. That said, I would stay out of the roof - for the rest of my life and have a professional take care of business.

I almost always have extra bottles on hand. It is extremely helpful to have a battery sprayer. I used a 1 gallon manual one for years and it works just fine. Battery sprayer is way faster and probably reduces the time by three quarters.

i have not tried the other product from wet and forget that connects to the hose. Many have found difficulty in the way the spray works. I dont want to try something new when this works great.

Moss, slowly wears off. Lichen growing on organic surfaces is the hardest, but it loosens that up too. I noticed that the lichen dries up and does not grow even after 2 years of application. I have used this product over 10 years now and this is a cumulative review.
67 people found this helpful
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B. Clark
4.0 out of 5 stars Wet & Forget... Too good to be true?
Reviewed in the United States on June 25, 2014
Size: 128 Fluid OuncesStyle: RemoverVerified Purchase
I heard about this product on a DIY talk show that I listen to on the weekends. It sounds too good to be true, but I'd hate to miss out on a possible good product! :)

The pros:
+ VERY easy to apply with a spray bottle or pump sprayer.
+ Work great on exterior brick surfaces, like chimneys.
+ Advertised - 1 gallon concentrate makes 6 gallons of ready to use product. Covers approximately 750-2250 square feet.
+ Advertised - non-caustic, Non-acidic, Contains no bleach.
+ Advertised - safe on any outdoor surface.
+ Advertised - one step process... Wet & Forget!
+ Advertised - EPA approved one step process that requires no scrubbing or rinsing.
+ Advertised - safe around plants.
+ Advertised - continues to clean for up to a year.
+ Advertised - can be applied at any temperature above 32° & no rain is expected for 4-5 hours.

The cons:
- Update - 2016 - The price has really gone up in the last year, making this product VERY expensive! Yes, this is a concentrate & makes 6 gallons, but that over $5 a gallon! I dropped one rating star for this.
- Work very s-l-o-w-l-y! Don't expect instant results on everything this product is applied to. It could take a month or longer for visible results.
- Slight bleach like smell when it's first applied. Not bad, but not scent free.

Closing comments:
▪ I sprayed the side of a shed & fencing that had green algae on it. By the next day, it wasn't green, looked white, which should wash off when it rains. :)

When I was reading the instructions on how to dilute the concentrate... 1 part Wet & Forget Outdoor to
5 parts water, I thought there had to be easier instructions. I found this on the Wet & Forget website FAQ (Frequently Asked Questions).
▪ For a 1 gallon container or sprayer, add 2-1/2 cups (20 oz.) of Wet & Forget Outdoor concentrate & fill with water to the 1 gallon mark.
▪ For a 2 gallon container or sprayer, add 5 cups (40 oz.) Wet & Forget Outdoor concentrate & fill with water to the 2 gallon mark.

► Update - June 25, 2014
▪ sprayed the green on the fence & on the concrete under our hose reel yesterday. Today, all that green is gone! Not everything I sprayed shows this kind of result, but so far, I'm impressed enough to up my product rating to 4 out of 5. :)

► Update -November 11, 2014
▪ We sprayed the driveway + sidewalk yesterday & I can already see it working on the driveway! The long range plan is not having to pressure wash the algae off the concrete in the Spring. :)
▪ I just ordered another gallon so I'd have it on hand, ready to use.

► Update - November 18, 2015
▪ Since I started using Wet & Forget on the sidewalk & driveway, I haven't had to do any power washing in years! :)
▪ This product is on the expensive side, so I shop around when I need more. The last 2 gallons I purchased cost me $24.97 a gallon at the Home Depot. If you buy 2 gallons on-line, the shipping is free! :)

► Update - March 9, 2016
▪ I've been using this for years & it works as advertised. The down side is how expensive it's gotten! Last year I paid about $25 a gallon, this year it's $34 a gallon!
▪ The best price I could find this year is here on Amazon & in my opinion, it's expensive! :(
98 people found this helpful
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Art S. in FL
5.0 out of 5 stars It works!
Reviewed in the United States on March 18, 2024
Size: 128 Fluid OuncesStyle: RemoverVerified Purchase
We live in hot 'n humid Florida. We have a sunroom that has a white metal roof that is usually half in the shade if not more at times. It gets really really green with heavy algae growth! In the past I used 30 Second cleaner, a long handled stiff scrub brush and drug a hose up on the roof. After several saturation with the cleaner, multiple scrubbing and housings it was clean for another few months. I had serious doubts when I ordered Wet & Forget especially when people said be patient it takes 2 to 3 months to work. So I followed the directions, sprayed it on the horrible green roof, marked my calendar, set a remember for 10 weeks and forgot about it. I got up on our roof and the green algae is gone!! No more scrubbing & hosing on a wet slippery metal roof. This stuff really works but you just have to give it time. Thanks for a great product.
6 people found this helpful
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Villager
5.0 out of 5 stars Astounding
Reviewed in the United States on April 18, 2024
Size: 128 Fluid OuncesStyle: RemoverVerified Purchase
This product is really amazing. We just spray it on our concrete drive and walk away. It gets cleaner and brighter with time. Did it in the Fall and it worked over the winter.
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A. J. S.
5.0 out of 5 stars Amazing product
Reviewed in the United States on April 24, 2024
Size: 128 Fluid OuncesStyle: RemoverVerified Purchase
We’ve been buying this stuff for years, and I’m pretty sure it’s alien technology. We spray it in our deck and exterior brick, and somehow the mildew just disappears quickly after a few days. It has a bit of an acrid smell, so wear a mask. I haven’t noticed any damage from using it, so it seems safe.
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Top reviews from other countries

Shivam Soni
5.0 out of 5 stars Product is very good and customer Happy..
Reviewed in India on February 23, 2022
Size: 128 Fluid OuncesStyle: RemoverVerified Purchase
Good product customer Very Happy
One person found this helpful
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Amazon Customer
5.0 out of 5 stars Good
Reviewed in India on January 26, 2020
Size: 128 Fluid OuncesStyle: RemoverVerified Purchase
Effective
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Mrs. Dorothy Hazlewood
5.0 out of 5 stars Five Stars
Reviewed in the United Kingdom on July 24, 2017
Size: 128 Fluid OuncesStyle: RemoverVerified Purchase
Appears to be working well
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