FWIW, I've had no streaking or problems with the silicon spray mucking up the glass, but I can't vouch for what others might experience when they apply it. As to the window sticking, I bet when you pull the panel off, you'll find that the regulator is shot. There's this one white plastic piece that breaks, and then it's down hill from there. In my case, the first symptom was the window sticking at you described, but then when I ignored it, it eventually stopped going back up. You'll certainly know for sure when you pop the door panel off.
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