HG Extra is a concentrated phosphoric acid based cleaner. It is biodegradable and safer to use than hydrochloric acid. Does not give off fumes. For use as the 'initial' wash on newly laid acid resistant tiles and natural stone floors including Quarry Tiles and Unglazed Ceramic Floor Tiles and most Slate to remove cement grout film (bloom) residues. Can also be used to remove efflorescence and white stains on tiles and brick as well as rust and oxide stains. Will not damage the grout or harm the tiles.
