I saw the really bad word used SILICONE. I worked in the automotive world the last 25 years, Ford, BMW, Honda, Toyota, John Deere, Nissan and every paint issue I have ever seen was tracked back to something with Silicone in it. Something as simple as underarm antiperspirant or a wrist band supporting cancer research cost millions.
Yes silicone is a lubricant but it is also the worst thing to ever have around your car if you ever want to repaint it. Very small PPM readings cause fish eyes in paint and can ruin a paint job.
I would suggest that you do as has already been suggested take the whole mechanism out clean all the old grease out replace worn parts. If rusty blast it and you can take the whole window mech. to a plating shop and have zinc plating put back on with chromate flash and lube with Lucas Oil Products, Inc. RED "N" TACKY #2. It is a red colored grease that has a anti-seize built in. I just did my 73 vert and it was amazing the difference from just cleaning and lubing with this grease. They go up and down with not drag and no sounds.
The old white grease was the thing years ago. This material is also a lithium grease but with modern updates.
This grease also works great in the wiper motor gear drive and power window boxes and tilt colums.
My opinion,
David