I remember GooGone was discussed here awhile back and several people, like myself, intensely disliked the smell of it. I use it mainly for getting the glue residue of labels off wine bottles. .
I recently picked up a more recent edition, GooGone Automotive Gel. It is far superior, almost no odour and I can spray it on and it stays in place, soaks into the gum and then wipes off readily with paper towel.