Some companies are really annoying about putting hard-to-remove stickers on things. Some children are even worse. Next time you encounter a stubborn sticker (regretted bumper sticker, perhaps?), leave the chemicals in the drawer and try some simple heat from a hair dryer.
Home improvement weblog Apartment Therapy has some easy instructions for removing stuck stickers, and it works for any surfaces that aren't too heat sensitive (so this probably isn't a great idea on easily melting plastic, for example). All it requires is a hair dryer and a little patience: just aim the hair dryer at the sticker's corner and blast it with heat. After about 45 seconds or so, the sticker should start to peel away easily — if not, go for another 45 seconds and try again. This method should minimise leftover sticker residue, as well, but if you do find some left over, a small dose of soapy water or lighter fluid should take care of it easily.
How To Remove Unwanted Stickers Uinsg a Hairdryer [Apartment Therapy]