My concrete shower has had mold issues for a long time, and although bleach is the worst for concrete, I’ve been using it to try and keep up with my mold problem. I just received my first Athos concentrate and am absolutely blown away. I watch black mold dissolve right before my eyes, before I even begin to scrub. I included photos of before, spray, and my “after” is without scrubbing — the mold disappears, and the scrubbing on top of it is making my shower look like new again so I can finally r...