Anvil Concrete and Masonry Cleaner and Etch #1450, 1 Gallon (128 Oz) Concentrate Used to clean and de-grease bare concrete surfaces to improve penetration and adhesion of paint, stains, and sealants Neutralizes new concrete and removes light rust stains from concrete, steel, and other masonry surfaces Use on interior/exterior uncoated surfaces such as garage floors driveways patios, carports, basement floors, and concrete walls It is biodegradable and safe to use near grass and plants Do not use on marble, granite, terrazzo, colored concrete, brass bronze or copper