Mark Rober (NASA Scientist): Defogging Windshields Instantly

So, what were his findings? There were four key steps to defog your window in around half the time:

1. First, turn the heater on full blast because hot air holds more moisture.

2. Turn your A/C on. This pulls moisture out of the air as the air passes over the cold coils.

3. Then turn inside air circulation off. Winter air is cold, so it doesn’t hold much water.

4. Crack your windows for a little bit, this will exchange the humid air from your car with the dry air from outside.

Source: A Scientist Just Discovered The Trick To Defogging Windshields Instantly

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