Just to add in on here about this.
I have a mk4 golf 5 door. The front windows are smooth and have no issues. But the rear windows by the looks of it, were not regulary used. What i mean is, the rear passenger window was opened last week. Went to raise it and it stopped 3/4 up and the automatically went back down. Tried again and took 3 attempts to get it closed. There is a thick streak at the top of the window going accross which makes think there were barley used.
Any tips on how to ease these windows without having to rip the door apart?
Thanks