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If you’ve ever woken up late for work, then you know there aren’t many things worse than walking outside to a fogging up and frozen windshield.

It’s often debated as to what’s the fastest way to defog your windshield by using the various settings of the vehicle’s heat and defrost. Do you use hot air or cold air? Do you turn your air-conditioning on full blast or use the recirculate feature.

Fortunately for us, YouTuber Mark Rober did all the scientific stuff and took the guess work out of the equation.

After a number of experiments, in consistent conditions, it was determined there are a number of anti-fog settings that will cut the defrost time in half.

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Rober laid it all out in a simple four-step process, if you check the video out around the 3:30 mark.

Step 1: Turn the heater on full-blast because hot air can hold more moisture.

Step 2: Turn your air conditioner on because it pulls moisture out of the air as it passes over the cold coils.

Step 3: Make sure interior air circulation is turned off.

Step 4: Crack your car windows slightly, if at all possible. This allows the humid air inside of the car to be replaced by dry air outside of the car.

If you follow these four simple steps, you too can make defrosting your vehicle WAY less of a hassle.

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