Outdoor Cleaner & Stain Remover - Mold, Mildew & Algae, 128oz

If you are tired of the aggressive roar and back-breaking labor of a pressure washer, Wet & Forget is often cited as the "lazy person’s dream" for home maintenance. However, the name is a bit of a double-edged sword: you truly can "forget" the manual labor, but you also have to "forget" about seeing results for a few weeks (or months). How It Works: The "Slow Burn" Strategy Unlike bleach-based cleaners that whiten surfaces instantly through a chemical reaction, Wet & Forget uses a non-caustic, pH-neutral formula (primarily alkyl dimethyl benzyl ammonium chloride). • The Process: You spray the solution on a dry surface. It kills the organic growth (moss, mold, algae) at the root. • The "Worker": Once the organisms are dead, the weather takes over. Rain and wind gently wash away the dead debris over time. The Pros • Zero Scrubbing: This is the biggest selling point. You spray it on and walk away. No rinsing is required. • Surface Safe: Because it contains no bleach or ammonia, it won’t damage your siding, roof shingles, or deck finish. It’s also much safer for surrounding landscaping than harsh caustic cleaners. • Long-Lasting: Once a surface is clean, the residual effect of the product helps prevent regrowth for up to 12–18 months. • Reach: The "Xtreme Reach" hose-end version can spray up to 30 feet, allowing you to treat second-story siding or roofs without ever touching a ladder. The Cons • The Waiting Game: This is not for people prepping for a backyard party tomorrow. Green algae usually disappears in 1–2 weeks, but black mold or thick moss can take 3–6 months to fully clear. • Weather Dependent: You need a dry day for application (at least 4–5 hours of dry time), but then you need subsequent rain to actually wash the stains away. If you live in a drought-prone area, you might have to manually hose it down once a week to see progress. • Not for "Dirt": It only works on organic growth. It will not remove mud, clay, or grease stains. Wet & Forget is an elite product if you are a proactive maintenance-taker. If you apply it every spring as a preventative measure, your house will stay pristine year-round without you ever breaking a sweat. Pro Tip: If your concrete is currently "black" with years of buildup, hit it with a pressure washer once to get a clean slate, then apply Wet & Forget every year after to ensure you never have to pressure wash again.

I don't know how this stuff works, but I've been using it for years. I just spray it on my siding and vinyl fence once a year and slowly it eats the mold and makes it look brand new again. Not sure why it only lasts a year, but it only takes one day a year to spray the places that get moldy.

This definitely works over time so don’t expect immediate results, but the before and afters from my house exterior in a VERY humid climate speak for themselves. Not only did this product get rid of the previous mold build up, it also significantly slowed down new growth. My before and after photos are about 4 months apart and those 4 months were during the most hot, wet, humid time of year. Highly recommend!

Happy enough with it. It's not a miracle-worker, but it does reduce algae and mildew. Nothing will beat good old elbow grease, but this stuff is good for spraying hard-to-reach or dangerous areas. It'll probably take multiples sprays/coats to work. In places where the sun doesn't reach, it'll be weaker, as should be expected, though it's tough since shade is also probably where mildew and such will be worst. Pleased enough with the purchase. Be sure you have some way to spray the solution once you've mixed it up, like in a hose or a pump.

It sure is better to spray this product than using a power pressure Washer machine. I spray this product for months now, and I haven't seen the green Algae Stain or black moss. I live in the tropical where it rains a lot, therefore moss and algae is more propense to reappear, and this product has been a back saver. The only bad thing I have to say about it, is that its price has gone up since last time I bought it, from about $30.00 to $$44.00+.

My father told me about this product and I’m addicted! It works so well and cleans your driveway, fence, deck, siding, garage door, and even outdoor furniture. I tell everyone about this.

I used a garden sprayer to spray the moss on our roof with wet and forget. Yes, it kills the moss. BUT- read the directions and follow them! My sprayer was new and the fitting came loose, leaking on my hand, back and leg. It was 20+ minutes before I washed it off. I was pretty sick for the next week, rash, fatigue, itching, brain fog. Also note the comment about not spraying near water. I was on the roof and doing my best to spray with low pressure but there was a lot of atomization and the breeze carried this everywhere. I was wearing a mask but probably should have had a full body suit and glasses on. This mist made its way to our little 90- gallon pond next to house and killed all the fish. Yes, I learned my lesson, the instructions say not to spray near water; I should have covered the pond; what appeared to be a little mist up on the roof went a long way on the environment. We made it 20 years in the pacific northwest without moss issues but the last few years, something has changed and we are getting consistent moss growth on the roof, rock walls, deck, and all around. My mixed review is based on the fact that it works, but this seems like a harsh chemical for the environment and the user. I don't know if I can recommend this or not My wife is hard set against it as she maintains a healthy garden around the house with many animals and critters.

Worked well on my house and shed. Didn’t completely remove all the moss but killed the green moss turning it brown. Have not used the product this year because my son who did the spraying claimed he may have had a bad reaction to the product even though he used the mask and gloves during application.

Waste of money and time, not beneficial at all.