So, my friend's gsx was treated to a bath of old, used motor oil a night ago. Him being unaware of paint maintenance philosophy, he tries to remove the oil with regular car wash soap and aggression w/o success. I was thinking of attempting a fix via PB bug squash, and if that does not work, I would try a clay bar. I have citrus degreaser as well, but the label says to not use it on automotive paints. FYI...his car was painted black by Maaco. Any thought or ideas to save me the guesswork? Thanks