Why does new marble have a white powder on it that cleans up with water but keeps coming back? How can one clean it off permanently?
When the marble is installed, it is set in a mortar base that is wet. As the moisture leaves the mortar, it carries with it-dissolved salts that are deposited on the surface of the stone in the form of white powder. This is called efflorescence. Unfortunately, every time you clean the floor with water you are only dissolving more salt in the stone, and when it dries, the salts return. The solution is not to mop the floor with water. Either vacuum the powder or buff it off with a dry pad. The salts will eventually work themselves completely out of the stone.
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