How Interior Fog Develops
Fog forms when moisture in the air settles on a cooler surface. Inside a vehicle, warm and humid cabin air can come into contact with cold windows, causing tiny droplets to appear across the glass.
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The moisture may enter the car in several ordinary ways. Wet shoes, damp clothing, rain-covered umbrellas, snow, and water carried inside on floor mats can all add humidity to the cabin.
Even normal breathing releases moisture into the air. When several people sit inside a closed vehicle, especially during colder weather, the amount of humidity can rise quickly.
If that damp air has nowhere to escape, it remains inside the cabin. Once the temperature of the windows falls, the trapped moisture condenses and creates the familiar layer
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Wiping the glass removes the droplets that have already formed, but it does not necessarily remove the humidity that caused them. This explains why fog can return only minutes after the windshield has been cleaned.
