Window squeaking is a problem with many Porsches as well. If its a glass in the rubber or rubber in the frame scenario,(seems most likely) the solution on the Porsche forum has been Pedros Ice Wax. It's a waxy lubricant that can be fount at many bicycle and motocycle shops. It can also be mailordered from Bicycle merchandise sellers.
If it's a metal on metal squeek then you will have to narrow down the two offending pieces of trim. If you can't remove and put a buffer of electrical tape between them then start sliding a piece of paper between them until you find the spot where the noise subsides. Then work a small piece of felt or electrical tape between the two.
Hope this helps. Noises drive me NUTZ!
