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I am not sure if these bathroom tiles are porcelain or ceramic. They aren't stained with a color, it's just the shine is gone in dull spots everywhere, especially around the sink which is why I think it must be from soapy water? I've tried a lot of things with no success (vinegar, baking soda, steam, every tile cleaner on the market) in fact some cleaners have left behind their own dull spot stains.
Help!!