Guys, just go to ACE Hardware store and buy this glue stain remover called Goo Gone
http://www.proppersource.com/images/expendables/Goo-Gone.jpg
Just pour a little bit into the gap of the sticker from the car body. As u pull along, pour a little bit to dissolve the glue.
Finally, after u have removed the whole sticker and u see some glue stain then just pour some goo gone onto a cloth and wipe it away without much effort at all.