I was power washing my driveway today to get rid of the some mulch that was left from yard work and while doing it the car was covered with bits of mulch. So I power washed the stainless. I have owned the car for almost 15 years, it looks better now than ever. Stains that I could not get out are gone! I don't know if you can hurt it or not, but it cleans better than anything I have ever tried. It also only took a few minutes. Even those tight spots on the rims are clean. Jack.