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

I wish I would have taken pictures. Pool side loungers have gotten ridiculously expensive so we found a couple for cheap off of Facebook marketplace. They’re the old-school type with those softer plastic material type straps going across a metal frame. The guys that sold them to us told us not to use anything with bleach because it would easily crack the plastic material. I tried everything, OxiClean, baking soda and vinegar, anything that I could think of that wouldn’t be drying or abrasive, to dry annd get the black milder stains off. But nothing worked, until I came across this stuff. We’ve bought it twice now and have learned by trial and error the best way to do it. The first year I got this stuff, I was a little confused, so I sprayed it all over the chairs and took a scrubbie sponge to it to completely rub it in. Then I rinsed the chairs off with the hose, let them dry, and then gave them another good spray down. I didn’t like how the product kind of pooled and dried sticky in the middle of the chairs since they bow downward, but then I remembered that the rain would eventually rinse that away and hopefully it would hopefully do it’s magic. Within a week, the little black mold dots that had been bothering me so much were suddenly starting to disappear! I was truly in awe at how each week that went by, the chairs just looked better and better without ever reapplying!! So Last year, I bought this stuff again and figured I wouldn’t bother with the whole spraying, scrubbing them down, and rinsing off. I just went out and sprayed them down real well and left them. Definitely did not work as well. So long story short, that’s the trick!! Spray it on, scrub it in real good, rinse, let dry, then spray on again and leave it. Hope this helps!

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.

Product works!Squirter did not work - was defective.I was able to dribble product on the appropriate area and came out the next day and mold was gone!

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.