The Oil Eater Overnight Stain Remover is designed to treat oil and grease stains on difficult, porous surfaces such as concrete, asphalt, and brick. Utilizing oil-eating microbes, the Overnight Stain Remover cleans beneath the surface in a simple, three-step process. Users only need to apply the stain remover, let it dry, then sweep away to restore concrete, brick, asphalt, and more. The substance works within 12 hours for exterior and interior surfaces alike, including fuel pads, parking garages, and driveways.