My wife's car has several dents in the bumper, enough to require a replacement. Also 2 of the plastic covers are fading and one of them has clear coat failure. Was thinking of detailing - as in compounding, polishing (as it has swirl marks etc) before I took it in for the work. I was thinking of doing all the car except leave the 2 panels and bumper untouched. Should I do this or wait until after the body work?