The easiest way: use an eraser.

Not only is the glue left behind after tearing off the label paper of plastic cups a headache, but most of the places where the tape sticks to the pan and then is removed again will leave glue. The simplest and most effective way to remove residual adhesive is to use an eraser. If there is a lot of adhesive residue, it will be more efficient if you wash it with water during the wiping process and then wipe it with an eraser.