If you wash your car at home, do it over grass or soil and not on a paved surface. When you wash a car on an unpaved area, you allow the soapy, dirty water to soak into the ground, where it has a chance to filter and soak back into the soil as groundwater. Be sure to use biodegradable detergents or soaps to wash your car, especially if you have your own well water on-site, since contaminants from chemical soaps can leach into your own water supply.
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