I have seen rain x product that was a defogger, and you can also buy a can of deicer fluid, spray a lot on a wad of paper towels, and wipe down all the windows inside the car, wipe every square inch just like you were cleaning the windows, let dry between coats, I do three coats, (10 minutes between coats) do it with the heater on if its cold, or do it just before winter starts. But this will keep all windows from fogging up.
This happens when moisture gets in, and when there is a temprature change, like when warm bodies get in a car, thier breath starts to fog windows. turn on the defrost, even ice cold air will help, crack a window on both sides, equlaize the temperature this will help minimize fogging inside too, but the best thing I found was that good heavy three coats of de icer fluid on all inside windows, this lasts about three months. good luck, its less than five bucks, compared to several hundred dollars for a window.
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