When changing exterior light bulbs in your car, watch your hands. Many automobiles use halogen bulbs, which can get extremely hot. Hold them with gloved hands or a paper towel. That will also keep the glass free from the oils on your skin, which can create an uneven heat transfer in the bulb and cause it to fail prematurely. If you do accidentally touch the glass on a new bulb, clean it with a cloth and some rubbing alcohol.