The rear windows in my cars get seldom use. In fact, I've noticed that these windows actually start to stick to the rubber which they are gasketed to. It is the rubber at the top, probably because it gets hot/soft in the sun, then starts to seep on the glass. Ive tried cleaning the window tops with glass cleaner to help this, but to no avail. I suppose I need to somehow treat the top of the window, or its surrounding gaskets to prevent this. Any suggestions? Of course it would need to be something that will not run or weep when wet, and something that need only be applied very sparingly. I can imagine that Krytox, talcum powder or silicone spray may be a good idea. Not sure if anyone has noticed this, and what might be recommended. Thanks!