I removed mine with a hair drier to warm it (if I'd waited for summer I probably wouldn't have needed it), peaked it off in strips, ad then used a soft cloth and lighter fluid to remove the remaining residue. A paint supply house will also have pinstripe and decal remover. If you're not sure where to get it, contact a local body shop, and ask them where they get their supplies. 3M is one good product, as mentioned. I've used it before, but this time I didn't need it.
Andy