Creaking wood trim driving me NUTS! (W126 380SE)

[donbryce]

OK, I searched and found no conclusive answer, except that a lot of you have expessed annoyance at the creaky/squeeky sounds of the wood trim against the plastic on the door panels of our beloved older MB's.
I had both driver side door panels off last night for access to the driver's door check-strap assembly (needed grease), and the rear door window mechanism (replaced plastic runner thing).
I removed the trim panel on the driver door, sprayed both the wood back and plastic surface recess where it mounts with silicone spray, and tightened up all the plastic nuts. It still squalks and creaks like I'd done nothing.
Before I replace the back panel, I'll try a coat of grease, tighten the nuts, and post back, but has anyone found the ideal compound to prevent this? Wax, if so what kind? Is there a silicone gel that might work? Why does all the wood trim on all the doors do this?