I have used super tile and vinyl cleaner (In The Swim) with a stiff brush to clean scum build-up on the tile. However, I used almost a full quart to do the job and this job needs to be done about once per week. Has anyone had success with a product that will prevent this build-up? If not, is there a better/cheaper way to clean the tile on a regular basis? I have used Mr. Clean Magic Eraser on other (non-pool) items and it seems to work really well. Wondering if it would be okay to use this for the pool tile.... or if it contains anything that I don't want in the pool. Thanks for any tips/ advice for keeping my pool tile sparkling clean.