If they are not painted on, take a hair dryer and warm them up and they will come off easier. Then just go back and use some goo gone on the sticky stuff left behind and then wash and wax the crap out of it so the paint doesn't get messed up from the goo gone stuff.
I used a hair drier and finger nail polish remover... just dont leave that stuff stay on to long... only thing I don't like since I removed them is if I look in a certain direction i can see where they were..
dam it, i started taking it off and then i found out that theres another one underneath which is painted on. then i took the nail polish remover to it and it started to take the painted pin stripe on but now my paint smeared. so now i got a crappy painted pin stripe and some smeared paint, yay.