As for white lithium, I would surmise that will make the problem worse, or even introduce new problems. White grease tends to become rancid, gunk up and become more of a cohesive than a lubricant - it then has real holding power. That's why I stopped using it on my garage door opener guide rail. (And, once on it's hard to get off.) Plus, I figure that tearing down to service a window regulator is not something a person would want to do routinely, if ever.
? I see a few comments related to Up-Down motor failure modes related to drag in the window regulation movers and pivots points. My sense is that window regulators are not regular (scheduled) service items and, as such, are most likely lubricated (or not) for life.
That said, there is another "lube" aspect that has not been addressed.
Shortly after acquiring a 2008-1/2 Taurus, I became concerned about window squeak as the driver window moved in its track - it was from "stickiness" between weather stripping and the glass, either at the bottom just where you would expect (you might see "strip prints" on the glass) but also along the sides. I brought this to the attention of my dealer service manager (along with notice a motor failure in conjunction with window drag squeak would be factory-caused responsibility), and inquired as to a factory specified window glide lubricant that would not harm the felt or rubber-like weather stripping components. Yes, they do use a special lube that Ford supplies, was the reply; but for owner-dyo service it is quite expensive - strangely, window lubing is not a dealer scheduled (or even unscheduled) maintenance item - go figure.
The glass-glide lube is called Motorcraft Mini-Vent Window Lube, 4 fl. oz., silicone based, $20-something per bottle, volatile and toxic if not used safely.
Since warm season is most associated with window drag (and probably motor failures as well if my experience is any indication)...probably best time to apply is start of summer...but also whenever window squeak is heard. Unfortunately for me, I did not get it applied in time to prevent (within perhaps as much as one minute's motor run time) the well-known, "passenger window motor up" failure mode.
The biggest problem? That you have to buy so much more than likely ever to be used or needed...but still much cheaper than even one motor purchase...even without installation labor.
If only there were not so few Fords on my block...I would have tried organizing a lube sharing, window glass lubing co-op!