To prevent scratches never use a dry rag. Your trunk and floor boards should be inspected for small holes. Exhaust fumes can be deadly. Worn tires will be of little use in winter weather. Examine tires for thread depth, uneven wear and cupping.
Check sidewalls for cuts and nicks.
Check tire pressure once a month. Cold weather makes tire pressure lower. Rotate tires, as recommended. Correct tire pressure can be found on your vehicle door jam. Put a few high energy bars in your glove box.