After two years from decoration time, the stone granite floor tile in toilet become yellowish, how to solve?

      Right now most of the Disinfectant cleaner used in family all contain acid and alkali which affect the stone greatly. The chemical material will affect the color of the stone surface and mineral in the stone. Very seriously, usually most of cleaner will take effect after 5 minutes reaction on the stone, and during the period of time, the cleaner has already spoiled the stone. So in toilet, it should use the cleaner which is neutral in acid and alkali value.

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