​What should I do if the car headlights fog up?

If the fog is not too dense, you can turn on the headlights and wait for fifteen minutes to clear the fog. Avoid directly exposing the headlights to high heat to prevent damage. Cracking or deforming the headlights would not be worth the cost.

If the fog is dense and there is water accumulation, it indicates a problem with the headlight seal. This could be due to damage to the lampshade, back cover, or sealing strip. In this case, it's best to have a professional disassemble the headlight for cleaning or replacement. Make sure to thoroughly check the headlight assembly and ensure it is properly sealed.