How long does it take for fogging in new car headlights to disappear?

[McHailey]

As long as you turn on the headlights normally every day, the fog should dissipate in about a week. Causes of headlight fogging: 1. Fogging caused by environmental temperature differences: During the rainy season, on rainy days or in winter, when the headlights are turned off and the temperature inside the lamp assembly drops, water molecules in the air can easily enter the headlight through the rubber ventilation holes. When the internal temperature of the headlight is unbalanced and the temperature difference between the inside and outside of the lens is too large, water molecules from the humid air will gather from the high-temperature area to the low-temperature area, increasing the humidity of these parts. Then, it will condense on the inner surface of the lens, forming a thin layer of water fog. 2. Fogging caused by vehicle wading and car washing: If the vehicle wades through water, the engine and exhaust system, being relatively large heat sources, will cause rainwater to form a large amount of water vapor on them.