How do you remove duct tape residue from a guitar?

i got a guitar from a garage sale a long while back, and well, the idiot who had it before me decided to cover the front of it in stickers (seriously cover it - like scales) and completely duct tape the back. anyways me and my friend decided to fix it up today, so we tore off the stickers and removed the sticker... show more i got a guitar from a garage sale a long while back, and well, the idiot who had it before me decided to cover the front of it in stickers (seriously cover it - like scales) and completely duct tape the back.

anyways me and my friend decided to fix it up today, so we tore off the stickers and removed the sticker residue by spraying windex on it and scraping it off with a pick, but that didn't work on the duct tape on the back. what can i use to get the residue off?
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