Spray Nine Concrete Cleaner is a powerful alkaline detergent designed to cut through tough grease and oil on concrete. This heavy-duty detergent penetrates, emulsi­fies, and dissolves ground-in dirt, grease and grime that other solutions fail to remove. On top of it, the solution washes away easily with water making it perfect for concrete driveways, garage floors, machine shops, sidewalks and much more!