Snow, ice and salt can wreak havoc on a car’s exterior. If you want to protect your investment and still navigate slippery highways and streets, wait until the temperature is above freezing, and wash your car down with warm water and soap, Safelite says, adding baking soda to the wash mixture if you drive on salted roads. Pay close attention to the undercarriage and wheels, since they have the most exposure to moisture and muck. Finally, dry the car completely. Repeat the process every two to three weeks to protect against the formation of rust.