Originally Posted By: bretfraz
You need something that has a little dwell time but won't hurt the paint. Check out Stoner's Tarminator or 3M Tar and Grease remover. Both come in a spray version. Spray on, let it set for 30 seconds or so, then wipe off. As was said above, it might take a couple applications.
I've used gasoline to remove crud from paint but you will need to wash and wax the area afterward.
Have you tried WD40?
Good point, I used WD40 before and it worked well.