When washing cars (PDF), the water runoff can enter the storm drains. This puts pollutants such as grease/oil, dirt, metals and soap to our local creeks. Even biodegradable soaps require oxygen to breakdown, depleting our creeks of the oxygen fish and other organisms need to survive. Also, just because the soap breaks down, doesn’t mean it breaks down into components that should be in the water. It is best to take your car to a car wash where the water is discharged to the sanitary sewer system or wash your car on a lawn or other surface where the water can be drained down and filtered through the soil.