The greenest way to wash your car is to take it to a car wash. It's much better for the environment than doing it at home, unless you are just using water to clean your vehicle. Car washes recycle the water used for washing cars. The waste water is cleaned and filtered. If you wash your car at home the chemicals wind up either in your yard or garden or they end up getting washed down the sewer, which leads to creeks, rivers, lakes, ponds, or oceans. These chemicals are not good for wildlife! Next time you need your vehicle washed plan it on the way to or from somewhere else, don't make a special trip, and take it to the car wash!