8 Reasons Your Windshield Fogs Up Inside (And the Fast Way to Clear It), by Drive Care Lab on YouTube. 14 min 3 s.
- Video length
- 14 min 3 s
- Time to do it
- 20 minutes
- Difficulty
- Easy
- Steps
- 9
What you need
Steps
Press the front defrost button, switch on the A/C and set the air to come from outside. Warm, dry air clears fog fastest.
Turn recirculation off in damp weather. Recirculating cabin air keeps the moisture inside and fogs the glass again within minutes.
Clean the inside glass in two stages: wipe an area with cleaner, then buff the same area dry with a second, clean towel.
Spray the cleaner onto the towel, not the glass, and use a light amount. Too much cleaner leaves streaks and a new film.
Check the bottle before you start. Never use ammonia-based cleaner on aftermarket window tint, and skip household glass hacks.
Wash or replace gritty, greasy microfiber towels. Dirty towels just spread the film back across the glass.
Stop smoking or vaping in the car and wipe the glass afterwards. The residue settles on interior surfaces and re-fogs the windshield.
Remove cabin moisture. Dry wet floor mats and jackets, and fix leaks or blocked sunroof drains that let water inside.
Replace the cabin air filter every 15,000 to 30,000 miles. If fog returns with a sweet smell, have the heater core checked.
Tips and common mistakes
Run the A/C in winter too, since it dries the air and keeps fog from coming back once the glass is clear.
Clean the glass in shade or on an overcast day so the cleaner does not dry before you buff it off.
Never wipe the windshield while driving. Pull over somewhere safe and clear it properly.
Wipe in straight lines and finish with a dry towel to avoid streaks that glare at night.
Questions
Why does my windshield fog up on the inside when it is not raining?
Moisture is trapped in the cabin, often from wet mats, damp clothes or recirculated air. A greasy film on the glass makes it worse, because fog clings to the film first.
Does shaving cream or toothpaste stop fogging?
No. These home remedies leave a smear that catches light at night. Cleaning the glass properly and drying the cabin air works better.
How often should I clean the inside of my windshield?
Clean it whenever you see a haze or a greasy sheen, and again after anyone smokes in the car. A quick buff at every wash keeps the film from building up.
This guide was drafted from the video's details and general task knowledge. It has not been checked against the full video. Check the video and relevant product instructions before following a procedure. Report a correction.
