You can effectively clean your travertine shower tiles without damaging the stone if you use the right products and cleaning methods.
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Fill a bucket with 1 gallon of hot water. Add a few drops of mild dish soap. Make sure the dish soap has no additives.
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Dip a soft rag or sponge into the soapy water. Wipe down the travertine shower tiles with the rag and soapy water. Rinse out the rag or sponge often while cleaning.
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Rinse the shower tiles with clean water. Dry thoroughly with a clean towel.
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Use an alkaline tile or stone cleaner if your travertine shower tile is especially dirty. Mix the cleaner into a clean, empty spray bottle according to the label's instructions. Some alkaline cleaners will be premixed and ready for use.
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Spray the cleaner onto the travertine tiles. Scrub the tiles with a stiff scrub brush, then let it sit for 20 minutes, or the time recommended by the manufacturer, and scrub again. Rinse the tile with clean water and dry thoroughly.