Waterless car washing, a review of the facts
you have total control. Self-Serve Car Wash: The best thing about a self-sevice (generally coin-operated) car wash is that you'll use much less water than you'd normally use at home. For an average sized, not-too-dirty car, a self serve car was uses up only 12 to 14 gallons of water. Plus, if you're using a self-serve wash with your own products, you can choose what to use. One thing you don't get with a self-serve car wash, however, is the lovely convenience of washing your car without even leaving the house-- or getting it all done for you at a full-service.