Well, it's water and it's wet. I have a beautiful car that barely ever leaves my garage, and today I decided to wash off some of that garage grime. Went through, came out and then spent 15 minutes trying to get rid of the soapy residue on my side panels. The machine seems to blast strong enough from the front, but the siderinse left all kinds of mung on the car. I didn't expect the rims to come spotlessly clean (and they didn't), but the soap residue was a disappointment. $10.