Iīd recommend a swab, scrapers for the windows, saw dust instead of sand (the weight is lighter and it seems to give better grip). There should be defroster for the locks in your pocket.
Freezing weather is an issue for some items, keep them in a bag and take with you when drive (unless you have a garage).
Make sure to keep your car in good repair.
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If it isnīt broken, it doesnīt have enough features yet.