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I have the same issue, right now it's warm enough that it's just fog and not frost, but to defog I've been using my little 22 watt solid state dehumidifier, of course once it gets cold enough that starts to frost up and stops working as well, but when it is warmer it works quite well at keeping the inside of the car dry and fog free.
I also plan to try using a ceramic 12v heater that plugs in, kind of wimpy but it should help.
I think the, that the Dash Sock (full of silica gel) or the dehumidifiers of the same idea that you plug in to cook the water out, should work no matter how cold it is.
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