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How To Demist Your Car Window

Drivers face many challenges during colder months of the year, including fogged up windscreens. When your windscreen is misted up you are usually left with one of two choices – wait until the windscreen is clear, or wipe it to clear the mist, despite the fact this will leave marks and streaks.

Below are some tips to demist your car windows as quickly as possible.

Why Do Windscreens Mist Up?

Windows mist up when the glass is cold because of the temperature outside. It happens when the air in the car is warmer and more humid than the glass. That’s why your windows can be clear when you get into the car but mist up within seconds of you closing the door. Your body adds warmth and humidity to the air, causing fog to form on the windows.

That leads us to our first tip – when it is cold and the windows might fog up, try to shake as much water off before you get into the car. This includes on your coat or umbrella as it will reduce the amount of water being introduced to the car’s interior, which in turn helps reduce humidity.

Demisting Your Windows Quickly

  • Use the automatic system – if you have a car that has a demist feature or heated windscreen, use it. There is no manual way that will clear the windows any quicker while leaving them clean and clear.

If you don’t have a feature in your car that helps with demisting, you should try the following:

  • Turn the heater on – turn the heat up full as warm air will remove water from the windscreen. If the car is cold, you will have to wait until it warms up but, once it does, the windscreen will clear quickly.
  • Turn the air conditioning on – air conditioned air is dry so it is perfect for absorbing the moisture inside your car. The best approach is to turn your air conditioning on and the heater up full at the same time.
  • Don’t recirculate the air – recirculating your air when it is cold makes your car warm up quicker, but it also keeps moisture inside the car for longer. When recirculation is off, your car will bring cold air in from outside. This air will have less moisture in it so is less likely to form condensation on the windscreen.
  • Open a window – you should do this for the same reason as above, i.e. to bring in dry air from outside to replace the more moisture filled air inside. The trade-off with this approach, of course, is that you will feel colder, but the windscreen will clear quicker.
  • Remember about the other windows – most of your efforts when demisting a car are focused on the windscreen, but the other windows can mist up too. The rear is usually the least problematic as it will have a demister. The other windows probably won’t, and they will probably take longer to clear than the windscreen.

Finally, always wait for the mist on the windscreen to completely clear before you drive off. It is dangerous to drive with fogged up windows as your visibility is reduced, plus you may find yourself on the wrong side of the law.




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