One of my sidescreen windows has become so stiff it is virtually impossible to slide it open. There nothing obviously jamming it. I have tried dry PTFE spray, as i didn't want any oil/grease on it, but without benefit. Anybody have any suggestions?
My drivers one is the same. Its had a good clean out but doesn't move as slowly as the passenger one. Not as bad as yours sounds. Might try the talc suggestion.
