I have marble bathroom tiles that are quite heavily soiled with soap scum. Can you recommend a nontoxic but effective cleaner/sealer?
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These tiles are quite dirty and "cloudy"
You will want to use a non-abrasive, pH-neutral solution -- one suggestion is borax and water.
However, it sounds like the tiles might be a bit far gone for a basic domestic cleaning. Consider hiring a professional tile-cleaning service that will not only clean the tiles and grout but will also apply a fresh coat of low-VOC sealer such as AFM Safecoat MexeSeal. (Locate green cleaning services near you in GreenHomeGuide's directory.) By resealing the tiles and grout, you can minimize scum build-up.
In the future, avoid using bar soap (unless it is pure glycerin soap), as traditional bar soaps will leave the scum you are currently experiencing. Liquid soaps work well. Lastly, squeegee all the tile surfaces in the shower after bathing. This will also help reduce future maintenance of the tiles.