If you have Farm & Fleet out you way they carry the "3M General Purpose Adhesive Cleaner Part No. 051135-08984" that Joe mentioned. I just picked up a Qt. can of it a few weeks ago, it is specificly made for removing trim adhesive.
Denny Graham
Sandwich, IL
p.s. Just as an addendum, I ordered a set of the “Corinthian Leather” door panels for my '50 when I ordered the upholstery set. They’re back ordered, and I’m just wondering if the reason is that they were having problems with them like you described and they decided to pull them until it's straighened out.