[header] How to remove stickers from glossy paperback book covers [title] Dip a cotton ball in a bottle of 91% rubbing alcohol. [step] Make sure it is completely wet around all the sides of the sticker alone. Be careful that it isn't the 70% rubbing alcohol variety, as those can be less potent and therefore won't remove as easily. 
[title] Rub the wet end of the cotton ball on the edge of one of the sides of the sticker. [step] Rub the sticker until it begins to discolor.