- Use the defroster and air conditioner. The defroster will blow hot air onto the windshield, while the air conditioner will help to remove moisture from the air.
* Start the defroster even when the vehicle is still cold to pre-emptively prevent a build-up of condensation on the windshield.
- Aim the vents towards the windshield. This will help to direct the warm air from the defroster and air conditioner onto the windshield.
- Clean the inside of the windshield. A dirty windshield can make fogging worse. Clean it with a glass cleaner and a microfiber cloth to remove any dirt, grease, or other contaminants.
- Use an anti-fog treatment. There are a variety of anti-fog treatments available on the market. These products can help to prevent the windshield from fogging up for a period of time.
* Apply a fog-resistant solution to the inside of the windshield to prevent condensation.
- Crack open a window. If the fogging is severe, you may need to crack open a window to allow some fresh air in. This will help to circulate the air and reduce the humidity inside the car.
- Park the car in a warm, dry place. If you can, park the car in a warm, dry place to help prevent the windshield from fogging up.
- Replace the cabin air filter. A dirty cabin air filter can restrict airflow and make fogging worse. Replace it according to the manufacturer's recommendations.
- Prevent condensation from building up on the windshield by wiping down the interior glass with a microfiber cloth.
Additional tips:
- Avoid using car wax or polish on the inside of the windshield. These products can leave behind a residue that can make fogging worse.
- Don't use hot water to clean the inside of the windshield. Hot water can cause the glass to expand and contract, which can lead to cracking.
- If you have a sunroof, make sure it's closed properly. An open sunroof can allow warm, moist air into the car, which can cause the windshield to fog up.
