I was having a difficult time removing sticky residue from a plastic table top when I got the inspiration to retreive the orange peel from my breakfast and rub it on the mess (orange side down). It worked like a charm!
to remove stickers from any hard surface, scrape what you can off, then spread on peanut butter. leave for 10-20 minutes, then scrape off gently. it should come off perfectly clean! the peanut oil deteriorates the adhesive.