We have coolcrete (The specific trade name is SunCrete according to some documents that I found from when the pool was built by the previous owners.) all the way around our pool and in some spots mold has grown in the depressions and crevices. I've pressure washed it, but I didn't want to get too aggressive for fear of damaging the surface. (Is this stuff solid, or just a coating applied over concrete?) The dirt and such cleans up pretty quickly, but the mold isn't going away at all. My thought is to mix up some bleach and water, then spray it onto the surface and let it work its magic for a while and then give it a good rinse with the pressure washer. I thought about using other concrete cleaning products, but I figure that if I use bleach then I won't have to worry if some of it gets splashed into the pool. Bleach is good!
Has anyone else done this? Is 1 cup of bleach per gallon strong enough? I plan to apply the bleach mixture early in the morning, before rapid evaporation becomes an issue. Any gotchas? Alternative solutions? Thanks!