Moisture inside a headlight usually shows up as a foggy film after rain, a car wash, or a big temperature swing. The housing is meant to breathe through a vent while staying sealed against liquid ...

Water is supposed to stay outside your headlights, not inside. Moisture in your headlights affects the optics, making them generally dimmer or even causing blind spots where no light shines at all. In ...

Automakers used to manufacture headlight lenses from glass.The bad thing is that glass limits a lens' shape and size so the OEMs switched to a more aerodynamically friendly and lighter ...