This product is amazing! My shower floor and glass doors were covered w/minerals and soap scum. I've tried everything and spent lots of time trying to remove the gunk. Nothing worked UNTIL this product from Fuller Brush. I had to apply it twice to the shower floor but it took hardly any scrubbing w/the brush before it was clean and shiny. Also, the basin in the vanity area was very dull; I thought I'd have to replace it. Well, after two applications of FB the sink looks like new ... very shiny and clean. I was so pleased with the results I ordered two more of the cleaner direct from Fuller Brush. The brush that comes with the kit gets into corners easily; it's the design of the brush. Definitely worth buying the kit to get the brush for showers.