[Volunteer]

I suppose just another safety / tech feature that contributes to cost and curb weight of new vehicles. (sigh) Problem solved but I wish to add that you can do wonders for ALL side glass that moves up or down, whether motorized or manually operated. Rain-X is just another brand name, a good product, but almost any other car polish-wax will work just as well. Decades ago I would use the old garden-variety Turtle Wax over body parts, plexi, AND regular glass with excellent results. Even with progressive formula changes they all still work and do not get fooled by people who say that the silicones will cause the (glass) surfaces to smear. In colder weather it is the lack of drying time of whatever product that will be noticeable unless you take time to buff it off well. I also find it convenient to carry one of the popular spray - detailing products at all times, kept in trunk or under seat, to 'freshen-up' the glass en-route as necessary. I am currently using Simoniz's Spray Wax Detailer (because it was on sale) and it works as well as the competition. Oh, and another tip, primarily for the older classics with sluggish window operation, is to examine and lubricate the linkages and mechanisms since these areas inevitably get dry and sticky which in turn impedes the window (up - down) functions. You will notice this when a slippery glass surface alone does not make window operation any better.