Glue something you now want un-glued? De-bonder to the rescue! Apply, wait a few moments and remove! The Super Glue Un-Cure De-Bonder by Bob Smith Industries as come in handy more times than we'd like to admit. We've been using Bob Smith Industries products since before modding Nerf blasters. They offer a great selection of cyanoacrylate (Super Glue) and more.
Please note this can leave a residue on some plastics it is wise to do a small test in an unnoticeable place.