3M suggested a citrus or orange "solvent" cleaner to attack the VHB tape. Assuming it is genuine VHB or something very similar, you can try that, and of course letting it work
in for a few hours. If the tape is pulled slowly, it stretches and peels like a very stubborn Command strip. Pull harder it is just stretches and snaps.
You can call 3M's toll-free numbers to see if this is still their current
thinking, or if they've found a better solution by now.
VHB is supposed to be compatible with plastic glazing, although any petrochemicals attack the plastics. It is also supposed to have enough flex so that it will allow the plastics to expand and contract
. Possibly this was not a UV-resistant grade of plastic, or the added stress from curving the material was too much for it?