Washing your car by hand at home typically can waste 50 gallons of water per 10 minutes. Commercial car washes are designed to save water and cut down on pollution. High-pressure, low-flow nozzles maximize cleaning action. In addition, modern facilities recycle their soapy water and reuse it. The Regional Water Authority has certified several local car washes for water saving and given them the “Be Water Smart” seal of approval.
Find that list plus money-saving coupons at http://bewatersmart.info/water-smart-carwash/