Paper
(1) can of Easy-Off oven cleaner (use the yellow can):

I tested this on the gas cap door first just to make sure it wouldn't damage my paint (it's a lot cheaper to get that small door painted versus having a whole panel painted). It didn't damage my finish at all....I didn't have to polish either.
Use the masking tape and paper and mask off above and below the pin stripe... working on only 2-3 feet at a time.