Tape residue sticks best to itself. Try using another piece to go over it a few times to pull it off your paint. I've used this method a few times with success.
NASCAR has a new website, classics.nascar.com where you can stream races all the way back to the beginnings. Some are just highlights but many are complete. Great resource!
Great news! Between the new Cup cars, modifieds, and now Indy cars this is a great time for race car modelers. Now if we could get some modern F1 cars my bank account would never recover!