Dont risk harming your grouts surrounding surfaces with highly acidic solutions. Granite Gold Grout Cleaner quickly and safely deep-cleans soiled grout, and is safe on stone, tile, porcelain, colored grout, ceramic and glass. The lightly citrus-scented grout cleaner is ready to use and safe on colored grout, and it comes with the Granite Gold Grout Brush to agitate dirt and grime.