Nothing is more frustrating than getting into your car and finding your windscreen misted up, especially when you’re in a hurry.
In a panic, you might start pressing every button in sight, hoping it will clear. But did you know there’s a specific method to demist your car effectively? In this guide, we’ll show you exactly how to clear your windscreen quickly and safely, so you can get back on the road without stress.
What Causes Cars to Mist?
The most common reason people think cars mist up is because warm body heat in the winter mixes with the cold air in the car. While this is when it is most likely to happen, your car can mist all year round. This is caused by a difference in temperature and humidity between the air inside the vehicle and the glass.
When you enter the car in winter, your body heat and breath warm the air inside. The moisture in the air then comes into contact with the cold windows and condenses, causing the mist. In the summer months, air conditioning can cool the air inside the car, while the hot, humid air outside causes condensation on the windows. However, misting is more likely after rain or when there’s high humidity.
Is it a Legal Requirement to Demist my Windscreen?
While the law doesn’t primarily state anything about demisting your windscreen, it does, however, require that 'windscreens and windows must be kept clean and free from obstructions to vision'.
This means that if your windscreen is obstructed in any way, it could be seen as breaking the law because it would impact your visibility, making it dangerous to drive. The Highway Code and various traffic laws emphasise that drivers must ensure they have clear visibility to prevent accidents and driving with impaired vision could be considered as careless or dangerous driving.
With this in mind, it is essential to demist your windscreen before setting off on your journey. Failing to do so can seriously affect your ability to react to road hazards. A misted-up windscreen significantly reduces your field of vision, especially in poor weather conditions or during night-time hours.
While there may not be a law that specifically mentions demisting, the act of maintaining clear visibility is legally required for safe driving. You are responsible for ensuring your windscreen is clear before you begin driving. Taking a few extra minutes to clear your windscreen and windows before setting off can prevent accidents and help keep you and others safe on the road.
How to Demist Your Car Quickly
Now that we know why the mist appears, here’s how to quickly clear the mist from your car windows. Follow these simple steps to restore visibility for a safer drive:
- Turn on the Heater
Start by setting the car's heater to the highest setting. In winter, this helps warm the air inside the car, reducing condensation. In summer, it can help balance the temperature difference between the cool air inside and the warmer outside air.
- Activate the Air Conditioning (AC)
After turning the heating on, make sure to turn on the air conditioning. The AC helps remove moisture from the air inside the car, which is crucial for clearing mist, regardless of the season.
- Use Your Car's Demist Button(s)
Many cars come with a demist button or a defrost mode. Turn it on for faster clearance. This mode directs airflow specifically to the windscreen, speeding up the process.
- Open the Windows Slightly
If your car doesn’t have air conditioning or if it's not working, you can open the windows slightly to allow fresh air to circulate. This helps reduce the humidity inside the car, making it easier to clear the mist from the windows.
By following these steps, you can effectively demist your car and ensure clear visibility, whether it’s hot and humid in the summer or cold and frosty in the winter.
Demisting Myths
There are many myths surrounding the best ways to demist your car windows. With so many tips and tricks online, it’s easy to get confused about what really works.
Does turning fans on cold rather than warm demist your car quicker?
This is actually a myth. Cold air can cause condensation to form on the windows, making the problem worse. To demist your windows effectively, you should use warm air, as this helps to increase the temperature inside the car and encourages the condensation to evaporate. Using both the heater and air conditioning is the best option for quick demisting.
Is it wrong to use a cloth to wipe the condensation away?
While wiping with a cloth might seem like a fast solution, it is not ideal. When you wipe the windows, you're only removing the surface moisture temporarily. Additionally, wiping can leave streaks, affecting visibility. Instead, it’s best to use the car's air conditioning and heating system to remove the mist more effectively.
Is this problem more likely to affect older cars?
While older cars may not have the same advanced climate control systems as newer models, misting can happen in any car, regardless of age. The issue is because of the differences in temperature and humidity inside and outside the vehicle. That said, modern cars often come with better air conditioning systems and automatic defrosting settings, which can help manage condensation more effectively.
The JCT600 blog is full of helpful tips and advice to improve your driving experience. Check out our current article and keep an eye out for more expert advice in the future. In the meantime, explore our wide selection of new and used cars on our website and find the perfect vehicle to suit your needs!