You could try gently removing them mechanically; use your fingernail or something softer than the finish (toothpick, popsicle stick, plastic scraper) carefully so as not to scratch the finish. Peel off everything you can. Lift, don't dig. Then for any adhesive and last layer of paper that is left on the surface, wrap duct tape sticky-side out around your fingers. Push it on the adhesive and then pull away rapidly from one edge over, sometimes the adhesive would rather stick to the duct tape than the finish. "Pat" it that way and you should be able to get most or all of it off with no chemicals. Watch out for an older, valuable instrument; for a cracked or crazed finish you may end up lifting the finish instead, take it to a pro.
Ohio Bassist Club #259
Last edited by OogieWaWa : 10-22-2013 at 09:51 PM.
Reason: Additional info