Sometimes I just
at some of you blokes who should know better.
Talking about the rubber inserts in which the windows sit, if they were designed to be lubricated then don't you think they'd come with lubrication already on them from the factory? They don't, so surely that tells you that they're designed to work without lubrication. Just looking at them shows they have a felt-like surface where the glass tracks and this supports and seals while minimising resistance by not allowing direct contact with the rubber.
If they're binding up then either they're full of dirt/dust/mud that is preventing that felt-like surface from doing its job. Either that or they're gunked up with lanolin or some other crap that is attracting the dust. Clean gently with detergent and warm water and rinse. When dry, inspect carefully to ensure that the felt is still in good condition. If it's worn through then replace.
If it's the regulator that's binding up then establish why. Parts of this are designed to be lubricated and may need a light smear of appropriate grease, however check for wear which may require replacement.