did a quick search and could not find something similar
My car has double glazing so do not know if this is what the problem is but when it goes up its a bit slow and when it comes down it again is slow but now and then it squeaks.
But as it does this the window gets vertical smears on it almost as though something is touching the glass and has a residue on it?
so my thinking was maybe its something touching it which causing a high amount of friction and as a result slow movement??
all other windows fine
any help appreciated
wanted to solve it before something serious goes or happens mechanically
sorry if in wrong area