How Do I Remove Frost on the Inside of My Windshield?
The best way to remove frost on the inside of your windshield is to hit it with warm air to melt it. Then, make sure to wipe the area down with a dry cloth.
Heat Your Car Up and Turn the AC On
Turning the heat on in your car is the tried-and-true method of removing frost on your windshield, whether inside or out. Crank up the heat, angle it toward your windshield, and you should see it start to melt within a couple of minutes.
Turning the AC on is also good as it will remove humidity from your car and pump dry air inside, speeding up the defrosting process.
Use a Warm Cloth
Use a dry cloth or microfiber towel to wipe away melted frost once the defroster has warmed the windshield, then wipe the affected area. The heat will melt the frost, and the cloth will soak up any water left over. The cloth must be dry, as a wet cloth won’t remove the moisture.
How To Prevent Frost From Forming on the Inside of My Windshield?
You can prevent frost from forming on the inside of your windshield by keeping it clean and your car as dry as possible. While that’s the simplest solution, there are some other things you can do.
Why Is There Frost on the Inside of My Windshield?
Frost on the inside of your windshield is caused by too much moisture inside the car overnight. When the temperature drops at night, the moist air inside the car condenses on the cold windshield and freezes. Let’s look at some of the probable causes of this:
Moisture
Excess moisture in your car often comes from tracking snow inside, either on your boots or clothes. When the snow melts, the water vapour is released into the air and absorbed by your carpeting and floor mats. Then, when the temperature drops overnight, it condenses on colder surfaces in your car, like your windshield, and freezes.
Weather
In humid areas, there’s more water vapour in the air. If that moisture-filled air stays inside your car, it collects on your windshield and freeze overnight.
Degraded Window Seals
Another cause of residual moisture in your car could come from damaged window seals. If your windows aren’t properly sealed, water can easily seep into your car, evaporate in the heat, and then freeze on your windshield during the chilly hours of the night.
Dirt
Having dust or dirt on your windshield actually helps frost form there. This is because dust and dirt can make it easier for condensation to form, as moisture collects on microscopic particles on the glass. The water droplets cling to the dirt and then freeze when the temperature drops.
Recirculating Air
Using the air-recirculation setting can trap humid air inside the car, which may contribute to fogging or frost on the windows. Recirculating the air in your car traps the moisture inside, exacerbating the situation.
Passengers
Excess moisture inside your car is also caused by people’s breath. We exhale warm air which stays inside the car. While this likely isn’t something you can fix, it is another cause of residual moisture inside your car.
Is Frost on the Inside of My Windshield Dangerous?
Yes, leaving frost on the inside of your windshield can be dangerous. The frost will decrease visibility, which, in the worst case, could result in a car accident. So, it’s best to remove the frost completely before driving your car.
Key Advice from MyChoice
- Remove moisture from your car whenever possible. Take out wet floor mats, snow-covered clothing, or other damp items before leaving your car overnight.
- Use rubber or plastic floor mats during winter, as they hold less moisture than carpet mats.
- Avoid using the air recirculation setting, since it traps humid air inside the car.
- Keep the inside of your windshield clean to reduce condensation buildup.