1400 psi pressure washer on a car paint job sounds like a bad ideal to me... If you get too close off comes the piant, wax, clear coat and if there is debree caught up in the spray stream it could act like a sand blaster.
Get the high pressure stream close enough to the rubber trim around a door and the trim will likely get sliced in half.
http://www.engineeringmotion.com/vid...hining-systems