Cigarettes are bad, they are harmful to your health, and they smell terrible. If you or a person you have along in the car with you smokes, then the smell may ...

Keep food out of your car. The best way to keep mice out of your car is to make sure there's nothing in there that's enticing, says Jeffrey R. Schmidt, market technical director at Terminix.

Water collects in that area, and if it sits long enough, it creates a musty smell. Most of the water is meant to exit the car through the evaporator drain under the vehicle.