heat gun on Low and heat large sections of the decal at a time. Too much heat on one place at one time and you will bubble the hood. Once you get the peel moving keep it going so as not to tear the decal and have to start all over again. Sometimes the sticky residue comes of perfectly but, if not, they have products to remove the sticky stuff. I have something call Sticker Shock from Orielly Auto Parts that works well.