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

I did a test — see photo — plastic fence was moldy after several years, so I sprayed half the panels with this product (on the right) and sprayed with water as a control (on the left). After two weeks, the panels I had sprayed were quite clean, as you can see in the photo. (Photo was taken a few months later, in winter, of two panels.)I have had similarly strikingly good results on the vinyl siding of my house.Note, that along with mold there is often trapped dirt. This product kills the green mold, but a bit of dirt sometimes remains, so results do not always look perfect, but the mold is gone and seems to stay gone.I have been very careful, as instructions say, not to spray on any plants, and to wear gloves, and not to breathe it in. When I researched this, I read that this is the same anti-mold chemical that hospitals use. And indeed, having worked in a hospital, this is what some of their chemicals smell like (not alcohol, a different smell.) Don’t use it if it will rain in a day or two; it must dry onto the surface you are cleaning. You can use it in cold weather, but not freezing cold.The product came with a detached sprayer, so I found myself lugging the bottle in one hand and spraying with the other hand, which was perfect. I much prefer doing that rather than buying the version that attaches to your hose, which does not seem as precise a delivery mechanism.Product also warns not to spray on anything that little kids will be playing on, or around, e.g. kids’ toys I suppose or jungle gyms that might get this on their hands and then into their mouths. I would also keep it away from any gardening areas, since molds and fungus can be an important contributor to soil fertility.The reason I wanted to use this method rather than power washing is largely because power washing is known to force water in between the cracks of vinyl siding and mess up the interior of houses. I didn’t want to risk that. But, on the other hand, this certainly is a strong chemical.

I got this stuff to clean the algae off our outdoor shower. I sprayed it on and it worked its magic and melted off. Not sure how this stuff works, but it was literally spraying it on and letting it do its job. It's super easy to use but it does stink when spraying it, so be cautious of that. Otherwise I would highly reccomend this stuff!

The sprayer was bad! I followed directions and no matter how many times I pushed the spray handle it wouldn't push through any solution. Finally ended up putting the solution into a different sprayer.

This stuff is AMAZING! It literally worked overnight for us! I am in disbelief that we found something to get algae and moss removed without pressure washing or scrubbing! My husband is very pleased and felt it has saved him a lot of time from having to pressure washing! It is literally just like it says…Wet and Forget! Thank you to the creators of this product! I am not one who typically takes the time to do reviews but I could not wait to do this one! I will have to share with my neighbors at the next book club meeting! Lol

We live in an area where the front yard gets a lot of shade and we are 'blessed' with algae, moss, mold, and mildew problems in those areas that need to be treated every now and then. A spray and forget product is the ideal solution for treatment vs anything that needs to have a scrubbing follow up. This seemed like it might do that from some of the reviews, but not so much.Application. The product is designed to be generously spread over the effected area using the included pump handle. While this would probably be effective for spot treatments, any larger area requires you to repeatedly pull the spray pump handle and soak one spot at a time over the entire area you want to cover. This becomes repetitive and painful if trying to do in in one go. Maybe transferring it to your pump sprayer would make it easier, but they get a 1-star as is it set up now. The coverage also leaves a lot to be desired. I was able to treat only a few sidewalk sections and a small part of the porch during this test run.Effectiveness. Half credit here. The product is designed to work its magic and then let rain and wind remove the remains for your cleanup. I sprayed on a Friday and the end of the next week we had our first wind/rain event. The mildewy green on the sidewalk sections did almost have most of their green topcoat cleared up in the first few days, but it was not 100% effective. The walk pictures here show the before and after shots and this was where it did the most good. The porch shots show the darker mold coverage that looking now it claims will take several months to remove. That's just not effective. Going out during the rain, I was able to foot scrub one of the darker spots that looks a little lighter in the after photo, but the rain poring on it was not cleaning it at all. So the Forget part of the spray and forget may work, but I can't have a product that takes months to finish. As for moss, the stonework around the flowerbed in the before and after shots show basically no effect whatsoever. The moss I test sprayed in the landscape timber shot does show some minor yellowing on one cluster, but the bulk of that piece and the remainder of the moss along it is still growing strong. Spraying the porch brickwork also yielded minimal results.So, overall, if you have the light green algae/mildewy coating on a relatively non-porous sidewalk, this is probably a solution that would work for you as it was effective for that limited purpose. Anything tougher I would suggest you pass on this for something stronger.

had lots of mold on my side of my house due to all the extreme temperatures here in Chicago and this stuff really works sometimes you have to agitated if in fact, you got a lot of mold, but I can tell you it does what it’s supposed to do. I’d buy it I paid extra to get it delivered today and it really did his job

I have been incredibly impressed with this cleaner! I used it on family headstones that were showing age. I do not live close so I’d just take the cleaner with me on occasional visits. Spray it good (in any climate) and let it do its thing over the course of a couple of years. The granite looks almost new now. Thank you for providing such a quality cleaner that’s helped me to honor my loved ones memories! My container is almost empty so I will be ordering more to keep them looking great.