I have an awful master shower that is not leveled properly and water stands in spots and causes mold. It also has tiny little tiles on the bottom and the mold grows between them. I would have to get on my hands and knees and scrub it using bleach and a brush until I found this. It is amazing! I sprayed the tile, turned on the scrubber and it cleaned it all up without choking me in fumes or forcing me to hand scrub.