Old Adhesive Removal

I have started to renew the interior of my gutted 71 Dart. There is considerable old spray adhesive "strings" where the speaker deck cover was and behind the door panels. What is a good way to remove this crap so that I can scuff up the factory paint underneath a lay a good new foundation over it? I am hoping that there is some kind of a solvent that will work well to remove this stuff. Thanks.

Jim