Which is greener, a commercial car wash or DIY? The answer: go with the pros.
Commercial car washes require an average of about 45 gallons of water per car, whereas home washers typically use between 80 and 140 gallons, according to the trade group International Carwash Association. That's a big difference! Federal law requires commercial carwashes to drain their wastewater into sewers, where it normally receives some treatment, versus simply running across the land.
If you are going to clean your own vehicle, check out the waterless wash products available now from many manufacturers, such as Eco Touch. Many are non-toxic, biodegradable and petrochemical-free. Just spray on, wipe and buff gently with a clean towel, and voila. Clean car.
article found on thedailygreen.com