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Tile, stone, and other chemical cleaning
Thoroughly spray water on the tile and stone cleaning surface as well as the surrounding sashes and glass. (This is to ensure uniform application of the chemicals and to prevent excessive penetration of the chemicals into the tiles and joints. The chemical (main agent: ammonium fluoride, concentration below 15%) reacts with calcium in the soil and is exempt from water quality standards and the Poisonous and Deleterious Substances Control Law.) Apply the chemical using a cleaning brush. (Use at a pH of around 3, similar to edible vinegar.) For stubborn dirt, perform polishing and brushing with a tile pad. Rinse thoroughly with water before the chemical dries. To remove residual dirty water that has penetrated the tile surface and any moss or other attachments in the joints, perform high-pressure hot water cleaning.