Concrete Brightener is a biodegradable liquid, heavy-duty alkaline cleaner and degreaser. It's safe and effective on concrete, marble, tile, terrazzo and asphalt surfaces. The deep penetrating solution dissolves and loosens greases and oils, quickly releasing their hold, cleaning and brightening the treated area. Pour it on, aggravate, keep wet, aggravate some more and then hose it off. If rust and other stains remain, follow up with Concrete Stain & Rust Remover. Available in one gallon sizes.