old Ithaca model 37

I have an old(40yrs) Ithaca featherlite that I put camo tape on(big mistake)15 years ago. Now I want to clean it up and give it to my buddies son for turkey hunting. The problem is that the tape will not come off the barrel or stock, any ideas on to loosen this old tape up? The shotgun is in pretty rough shape but I had it choked to extra full years ago, and if I get it cleaned up it will be a nice turkey piece for a young guy. Thanks for any help.