Since making that window lube tutorial my windows have gotten sticky again. On second glance we found that the teflon "V" at the bottom of the window was worn. We think this may be the underlying cause of the problem. My husband/mechanic/knight in shining armor says the part should be brass. If anyone expresses an interest we can fabricate some brass "V"s and see if they solve the problem. I volunteer my VX to be the first guinea pig.