In December 2015, my mother and stepfather bought a new home. I have my own bathroom, and I CANNOT get rid of the soap scum of the walls of my standing shower, and brown spots on the shower floor from the previous owners.. I've put hot water on the surfaces, put soft scrub on a Mr. Clean Magic Eraser and done circular motions. I've tried Tilex, and Zep too.. I'm just completely STUCK on how to get it out.