I did a test spot last fall on some using my surface cleaner. I was afraid it would rip up but it didn't. Only using hot water didn't clean the surface though. It was just a test to see if chems were needed or not.
Ron and I spoke to some of these salespeople at the concrete convention. When we asked them about cleaning it they looked like deer in headlights but eventually said medium pressure was the way to do. I got the feeling they weren't too concerned with what happens with it after they've made the sale.
After trying with the surface cleaner and hot water, I did d/s some house wash onto it. I hit it again with the s/c but the staining on that particular area was still there. It was only a small area so I never took the research any farther.