Hair dryer, heat up the letter for just a minute, pry an edge and direct the heat as you slowly pry/pull the letter. You will see the adhesive pull away from the car. If you pull to fast you will see the adhesive stick to the car, so slow down and all of the adhesive will stick to the letter. Zero/nothing will be left on the car if you take your time pulling up slowly, say about 30 seconds per letter. Did one letter with floss and ended up spending more time trying to remove the leftover adhesive off the car. Once I finished, a nice coat of wax and it was good to go!
