How to Stop Your Windows Misting Up

Misted windows are caused by warm, moist air inside the car meeting cold glass. It is a nuisance in the UK for most of the year, but it is also avoidable with the right settings rather than just wiping the glass every few minutes.

Use air conditioning, even in winter

Air conditioning dries the air as well as cooling it, so running it — even with the heater on for warmth — clears and prevents mist far faster than heat alone.

Direct air at the windscreen

Use the windscreen vent setting rather than the footwell or face vents when misting is a problem, so dry air is hitting the glass directly.

Crack a window slightly

If you do not have working air conditioning, cracking a window slightly reduces humidity inside the car by letting some of the moist air escape.

Keep the interior dry

Wet umbrellas, damp mats, and wet clothing all add moisture to the cabin air. Drying these out (or leaving them out of the car) reduces how quickly windows mist up in the first place.

Check for a hidden leak

If misting is unusually bad or the interior generally feels damp, it may be linked to water getting into the cabin somewhere — worth ruling out rather than just managing the symptom every journey.

A demisted windscreen before you set off is not just about comfort — it is a legal requirement to have a clear view of the road.