Thought I'd share how I get the sticky off of books that have had stickers on the cover. First of you have a heat tool or even a hairdryer will work then use that over a sticker first and it will peel off much easier. Then if it leaves a residue I use a mixture of olive oil and baking soda to form a paste. Rub a little bit over the sticky part and then rub off with a paper towel. Works like a charm 😁