Wet & Forget 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.

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+.

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.

Works great and will use again. Two caveats: 1. Cover all bushes that may be in path of overspray. Will discolor the leaves. 2. It will not clean siding right away. Give it a couple weeks for it to work its magic. It does work!!!

It makes a difference when applied. The real wow is it keeps working. Applied last fall and looked better. Now coming up on a year the prior staining on siding almost can’t be seen at all. It takes time, but super easy to apply once and forget it. Buying more to use on other houses in the family.

Provided decent clean first application but didn’t remove any mold or algae with a hard pressure water hose.

I used this on my asphalt roof shingles and my vinyl siding. Roof had black stains and siding has green streaks. It a week the siding was clean and the roof was better. Needed a second application on roof. Did not scrub or rinse either, much better than using chlorine bleach and tsp and scrubbing.

Waste of money and time, not beneficial at all.