How Does a Car's Headlights Become Foggy?

Cracks and Moisture The biggest factor in a car's headlights becoming foggy is a crack in the headlights. Most car headlights are made of plastic, and plastic has a tendency to become pitted or cracked over time. Small cracks can allow outside moisture to pool inside the headlight; heat from the headlight bulb can cause the moisture to condense and cloud the headlight lens.

Sun Damage Long-term sun exposure can permanently cloud and fog up a car's headlights. The sun's ultraviolet rays penetrate deep into the plastic of a car's headlights. Over time, the plastic starts to warp and lose its luster and clarity.

A hazy, foggy film then develops and obstructs a large portion of the lighting capabilities of a car's headlights. Snow, Ice, and Sleet Temporary causes of headlight fogginess are snow and ice that freeze to the outside of a car's headlights. If the temperature of the outside air is cold enough, a small, thin layer of ice and/or sleet can cover the headlights and obstruct the ... more.

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