Overnight Stain Remover is an all-new, award-winning product designed to remove oil and grease stains from porous surfaces like concrete driveways and garage floors, this product uses oil-eating microbes to clean deep beneath the surface, removing oil stains at the molecular level. Oil Eater's team of experts designed this oil stain remover to safely and effectively use at home or work - just 3 effortless steps: apply, allow it to dry to a powder and then sweep away the powder for a stain-free surface. Older stains that have bonded with concrete or pavers may not be possible to restore fully, but product should help minimize appearance of oil stains as much as science allows.. Approximate Coverage (sq. Ft.): 25. Features: Biodegradable,No-Rinse.