Search for Tile Glow ® # 1 Gray - 12 lb. Tile Glow ® #1 is a natural, non-wax compound for the honing and deep cleaning of most un-glazed ceramic, porcelain and quarry tiles. It does not contain any hazardous acids or solvents. It contains citric acid, a \"natural\" acid used in food preparation. on Amazon (or for the code 850002448207)