Olive oil works to remove sticker residue. Not quick. I have removed old sticker residue from aprons (early solid state era) with NO loss of the original artwork.20130104_131149.jpg20130104_142131.jpg

It has been a year + since I did it but something like an hour or two then rub with a rag and repeat as necessary.

Just pour a small amount where needed and spread it with your finger. If you look close at the picture you can still see where the sticker was because the blue has not faded there.