Condensation On the Inside of Car Windows

Every car owner knows how much of a struggle it is to get rid of windshield and window fog. Not only does this make driving in bad weather nearly impossible, but it’s also really annoying for everyone trying to keep their window clear. 

In this read, we will take a closer look at windshield and window condensation,  whether you have clear windows or have installed window tints, so keep reading!

Some of the main reasons for windows and windshield fogging include;


Temperature is one of the main reasons why car windows and windshields fog up. The air surrounding the car is at a much higher temperature than that of the outside, causing the window to fog up.

Humidity and Ventilation

When there are people inside the car, a lot of humidity is created from their breathing and the use of air conditioning. This, in turn, makes the windows fog after a short time.

Accumulation of dust

When dirt accumulates on the glass surface, it makes the windows foggy. During rain or extreme humidity, certain substances are released by plants that react to form a gluey substance on the glass. This then accumulates dust making the windows very foggy.


When condensation occurs, fog builds up on the windows and the windshield. What is condensation? It is the process by which a gas or vapor is changed into a liquid by the presence of a liquid or solid surface.

Accumulation of salt and minerals

This reaction between the glass and water can cause windows to be foggy and hard to clear. Another issue, which makes it difficult for owners to get rid of the fog, is that its accumulation increases over time, making it difficult to clean at times.

How to how to stop your windows from getting foggy

Dealing with foggy windows and a windshield can be very annoying, especially when you are driving. To prevent it, turn off the air conditioner and make sure that the airflow is directed towards the windshield. Car window seal keep out unwanted debris, contaminants, moisture, and other elements from the bad weather. This will help prevent window fog build-up.

To get rid of fog after it has already accumulated, ensure that all windows are shut. Switch on the heater or AC fan to high speed for around 10 minutes to remove moisture from inside the vehicle. This might not be much of an issue when the weather is cool but can prove problematic when summer sets in, especially in humid areas. Cleaning regularly will also go a long way in preventing the accumulation of dirt so ensure that your windows and windshield are clean at all times.

Some cars also come with a defrost button that blows air and heats it and can be activated by a switch on the dashboard.


If you have been wondering how to get rid of fog inside your car quickly, then now you know how to go about it. It is important to note that defogging and demisting can take a while, so do not be alarmed if your windows don’t clear right away. 


Sudarsan Chakraborty is a professional writer. He contributes to many high-quality blogs. He loves to write on various topics.