Before you repaint, you need to remove the foreign paint and see what's underneath it. It might not be as bad as you think. I rubbed a white steel/concrete post with my Jeep's bumper and it left white paint deeply embedded in the bumper. But polishing the spot with Menzerna Intensive Polish removed all of the foreign paint and underneath there was no visible marring. If you saw the spot today you wouldn't even know it had ever hit anything.
I bought my Menzerna polish at http://www.properautocare.com