Ice scraper, brush, studded tires, shovel (it's plastic not metal so i can dig under Princess without damaging her),
the dash sock.
The dash sock also got a little brother with rice in it, it seems about half as effective.
I'm also testing one of these this year:
Torrbollen.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)