Since this is an anything goes section I'll venture this question to you all. Have you found a high quality cleaning agent for tile and grout in bathroom showers or any tile and grout for that matter. Also something that can dissolve soap scum from shower doors made of plastic. Thanks in Advance. We did stop at a tile retailer and purchased an acid based cleaner but I'm reluctant to use it if another agent less harsh will do the work. TIA