Foggy windows in your car can be dangerous. A well-placed pair of socks filled with some kitty litter can absorb moisture and prevent the fog from ever happening.
YouTuber DaveHax explains how and why kitty litter can help with your fog problem in this video. He uses silica cat litter because it's super absorbent, sucks up damp odour, and doesn't smell like the chalky stuff.
Fill one sock with the kitty litter and then wrap the other sock around it all to keep it nice and secure. Now place the sock in your car and some moisture will get absorbed overnight. Easy!
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