I removed the top layer of asphalt before I realized what I was doing .Ripped a shutter off the house before I realized what I was doing , Destroyed a section of house siding .
Mine is a 3,00psi Honda with Karcher tips. The only thing I feel safe using it on is our concrete, and it is almost a must in the spring on all the vinyl siding.To me (imo) all the cosmetic things on a car are in need of hand care only.