This is the answer to faster, safer removal of hardened or cured concrete residues, mortar, cement based stucco and grout off virtually any surface. It is an acid alternative with no fumes. It does NOT contain muriatic, hydrochloric, hydrofluoric, sulfuric or phosphoric acids. It attacks the portland in cement, completely dissolving the hardened molecular structure back into rinsable mud. It's SAFE on Painted Surfaces, plastic, aluminum, glass, rubber and more. Use it on mixers, forms, pumps, screeds, vibrators, augers, concrete saws, shovels, and finishing tools.