Q: OK, that's a good idea, but the plastic split at the seam (Photo 4A). Now what do I do?
Q: But I don't have any duct tape; now what do I do?
A: Go out to the store and buy some duct tape, and while you are there, pick up some garbage bags.
A: Put the tray in the freezer overnight (Photo 1D). The next day, immediately after removing the tray from the freezer, drop it from about six feet high onto a concrete floor (Photo 2D). All the frozen hot melt glue will shatter, leaving you with a clean tray (Photo 3D).