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Silica gel cat litter (usually blue colored) is the same stuff used in those little packets as a desiccant. I bought a bag to solve that problem in the Prius, but it turned out my fogging issue was the result of the windscreen not being attached and water getting in. I attached the windscreen and solved another water leak and that solved my issue. Never did get around to filling tube socks with cat litter and seeing if it would help, but it's a cheap thing to try.
Other than that, I'd be tempted to install a block heater so the car warms up quickly and has hot air to clear the windshield.
As an aside, silica gel can be reused by heating it in the oven.
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