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Harvard Chemical Research Tile and Grout Restorer works on the acid side of the pH scale removing soils and stains on grout, tile and stone that have been neglected for years. This product actually removes a very thin layer of grout, taking with it all hard water deposits, soap scum and efflorescence. It renews the appearance of ceramic tile, porcelain tile, grout, granite, slate and sandstone. Keep this and all chemicals out of the reach of children. This product is for commercial, institutional, and industrial use only. In case of contact immediately flush area with plenty of water. In case of eye contact seek medical attention promptly. Avoid contact with skin, eyes and clothing. Care should be taken to test prior to using for safest results. Keep out of the reach of children! Use chemical resistant gloves and full eye protection when handling this product or any chemical. Appearance: light blue solution. Odor: mild odor. pH (of 1 percent dilution): 1.5-2.0. Biodegradability.