Grout HD penetrates and quickly removes ground in grime from Tile, grout lines, and Natural stone, leaving behind a bright and revitalized surface. Grout HD utilizes cutting edge technology to provide a product free of harsh chemicals like strong acids and caustic soda, allowing it to be safe on skin and the environment. Effective on dirt, grease, wax, mildew, and soap scum on terrazzo, Granite, ceramic, and travertine.