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

This stuff works! I recently moved and took an outdoor statue that was very discolored. It started out to be a gray concrete, but with weathering, had become almost black, not very attractive! As the indoor version of this product works great in my shower stall, I thought it was worth a try! I was right! The 'gunk' appears to be just melting away. No scrubbing, no rubbing, just spray it on, just like the inside version which you rinse off. Outside, I let the rain do the rinsing!

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!

It works well to kill moss which is what I bought it for. It does take a lot of product though, as I had to apply three times to kill the entire area of moss. The built in sprayer is nice. It took me a few minutes to figure out I had to keep pulling the tubing out before it would work.

My North side wood deck had green algae on the mostly shady half. Sprayed this liberally on a cool morning and it was gone within a few hours. Used about half the solution. Was shocked that it worked so well and so fast.

Pro: I purchased 3 of these to cover the area that needed to be cleaned of mold, spattered black spots of unknown origin, and green algae on concrete. The trigger was easy to use, no smell, no leakage, big size, and has a trigger spray or stream that my hands were able to use for two hours which was a pleasant surprise because I have arthritis in my fingers and joints. I only used the stream instead of the spray nozzle because it dispensed a larger quantity onto the concrete. The container is attractive, but I found it too heavy to carry for long, even switching hands frequently. I'm shorter in height so I could set it down on the ground sometimes and that helped me finish the job.Con: I didn't see any changes in the appearance of the concrete, but the bottle states it can take anywhere from a month to a year for it to work it's magic. Obviously, there is no way to currently review its' effectiveness at this point! I've given it a 3 star rating for now, but if Amazon lets me, I'll come back to comment on any changes when I see any.

You see and hear commercils thatmake a lot of promises and I've triedsome w/ no positive results. This productis NOT like that because it WORKS. I usedthis product on my wooden deck and likemagic the green mold is gone. I don't knowhow you made a product that works so well,but I'm a believer. If you try it and it does notwork, I would love to hear from you. This stuffis AWESOME!!

Killed the moss on my roof, it was thick.

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.