According to some research from the folks at AboutMyPlanet, washing your car at a commercial location uses only half the water. That water also gets treated so that it can safely go back into the environment, whereas at home, it does not.

When someone washes their car at home, the waste water and soap goes down the driveway and into the storm sewer, which goes untreated into the environment and causes environmental damage to lakes, streams and river ecosystems.

Check out the full article to learn more.

Picture via sxc.hu.

First of all, the only two cars I have ever owned were bought used. I like to think that this is environmentally sound in the fact that I am trying to use the car to its fullest before it is sent to a scrap yard somewhere. Along with this I pride myself in taking very good care of my car including regular tune-ups and check-ups. The EPA suggests maintaining your vehicle according to the instruction manual will increase your fuel efficiency and decrease your carbon emissions.

Like being tuned up regularly, it is a good idea to keep your car tidy. I am a bit of a neat freak anyway but a well-organized car is more important than you think. The fewer things you have in your car, the more fuel efficient it is because your vehicle doesn’t have to carry around as much weight and work as hard to get you where you’re going.

Read more of this story »

When you wash your vehicle on a paved surface such as a driveway or parking lot, all that dirty, soapy water has to go somewhere. Chances are it flows into storm drains, which lead directly to creeks, lakes, and streams harming water quality and wildlife.

Believe it or not, taking your car to a commercial car wash is actually better for the environment than washing it at home. They use less water, and are required by law to send used water through to the sewage system where it will be treated. Many commercial car washes, especially in drought-prone areas, will recycle or reuse their water - but ask just to make sure. And don't make a special trip to the car wash — stop by on your way to or from somewhere.

When washing your own at home, look for chlorine free and phosphate-free soaps, like Dr. Bronner's Castile Soap, Bi-O-Kleen multipurpose cleaner or a green car cleaner such as Simple Green. Or try a waterless car wash product that you can spray on and wipe off with a cloth.

Use a spray nozzle on your hose, or take some gray water from your house to conserve water.

Park your car on your lawn or grassy area. The ground will serve as a natural filter for the run off.

Make your own car wash kit to redirect dirty water away from the storm drain. The city of Seattle has directions on how to build your own using a pump, a hose and a few other items you can find in your local home improvement store. (This kind of thing might be best for school or church fund raising car washes.)

Amy says: I've always preferred taking my car through the car wash, not because it was environmentally safer, but simply because it was easier and always got my car cleaner than I ever could.

More on enviro-friendly aspects to car washing:

Stormwater Magazine

Grist

About.com

Related info from GO:

Nude Car Wash

Car Sharing Services (so you don't have to worry about washing the car)