I want to remove the decals from my bike

The older the bike, the harder it is to remove the decals. On new bikes they will peel right off. On older bikes a hair dryer or heat gun will help soften the sticker. Be patient and re-apply heat as needed. Most likely it will leave some glue residue. WD-40, Goo-Gone or turpentine will help remove the residue. Follow with a good coat of cleaner/wax.