Sorry it took so long to get back to this. The stuff I use is called Bio Breakdown. It's a citrus based adhesive remover. Tested on a piece of 50's Gretsch wrap. I put a rag over it to keep the glue area saturated. Let it sit like 20 min and could rub the glue off with the rag and fingers. No damage to the wrap what so ever. Heavy citrus smell though.
http://www.citrus-adhesive-remover.c...breakdown.html