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Good instructable. You may want to check NASA's standards:- https://nepp.nasa.gov/index.cfm/5544- https://standards.nasa.gov/standard/nasa/nasa-std-87394
Stuff a sock with silica gel crystals, tie the open end, and put it under a car seat or in between seats. That silica will absorb humidity and make for easier winter days with less condensation on the inside. Please note that you can find some cat litter which is that; do not use any other type as those aren't as good at absorbing moisture from the air.
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