LPT: Want to remove old sticker adhesive from a hard or plastic surface? Use a thick oily substance like peanut butter or mayonnaise to help get it off!

I've used this trick to get old price stickers off my VHS cases (plastic ones, not cardboard), and to remove branded stickers off glass spice jars I want to reuse and relabel. Always works like a charm after letting it sit for a while.