Coyote Concrete Cleaning, Scottsdale

Instead of brute force, Coyote Concrete Cleaning relies on science to remove stains from concrete. The outfit's technicians employ an enzyme solution—no water is involved at all—that penetrates porous concrete and eats away at deep-seated oil. Because the process creates zero water runoff and doesn't pose a health threat to pets or plant life, the Environmental Protection Agency gives the treatment its stamp of approval.