If you stretch the material off rather than peeling it back, little to no glue stays on the car. You'll notice, I just let the sun hit the front of the car and the complete removal took about ten minutes including the couple of tiny spots of glue. BTW, the use of WD40 makes great sense because if you use a solvent, the glue sticks back down as the solvent dries. Next time someone calls be because they left glue all over their car I'll tell them about that.
Robert