How do you clean the inside of a windshield?
Reviewed by the Skyview Auto Glass technical team — NWRD-, ASE- and DINITROL-trained technicians · Updated November 2026
Quick answer
Clean interior glass with an ammonia-free cleaner, two microfiber cloths, and the car parked in the shade. Wipe in straight overlapping strokes, then buff dry with the second cloth before the cleaner evaporates. The haze on the inside of a windshield comes from plastics off-gassing onto the glass, so expect to repeat the job a couple of times a year.
What to have ready
- Two clean microfiber cloths — one for wiping, one reserved for the final buff.
- An ammonia-free glass cleaner, safe around tint and interior trim.
- A shaded parking spot or a garage, so the cleaner does not flash dry.
- A small step or knee pad if reaching the top edge of a tall windshield.
How to clean interior windshield glass
Work top to bottom so drips land on glass you have not cleaned yet.
- 1
Brace yourself for even pressure
Position yourself so you can press evenly across the full height of the glass — bracing a forearm against the headliner or door frame keeps the pressure constant.
- 2
Spray the cloth, not the glass
A dampened cloth keeps cleaner off the dash, the headliner, and the electronics around the mirror.
- 3
Wipe in straight overlapping strokes
Horizontal strokes across the top half, then the bottom, overlapping each pass by about a third.
- 4
Buff immediately with the dry cloth
Go back over the same path with the second cloth before any cleaner dries on its own.
- 5
Check the view from the driver’s seat
Squint across the glass at an angle; remaining film shows up as a dull band you can wipe again.
Go easy around the mirror and camera area
The patch of glass behind the rearview mirror often carries a camera mount, a rain sensor, or a wire harness. Dampen that area with the cloth instead of soaking it, and never spray cleaner directly onto the housing — fluid can wick into electronics that were never designed to be washed.
Why the inside of a windshield films over
That faint haze is plasticizer — compounds given off by the dashboard, seats, and trim that settle on the coolest nearby surface, which is the glass. New cars off-gas the most, which is why a recent vehicle films and fogs faster than an older one.
The film also holds moisture, which is why a dirty interior windshield fogs up before a clean one does. Removing it helps visibility and defogging at the same time; see our guide to stopping car windows from fogging up.
What to use to clean inside of windshield — and other questions
How do you clean the inside of a windshield without streaks?
Streaks come from cleaner that dries before you buff it, a dirty cloth, or too much product. Use one damp cloth and one dry one, work in the shade, and buff each section right after wiping it.
What should I use to clean interior windshield glass?
An ammonia-free glass cleaner and microfiber cloths. If the film is heavy, a dedicated auto-glass polish removes the off-gassing layer more completely than a general cleaner.
Why does the inside of my windshield fog up after I clean it?
Usually residue. Cleaner left on the glass, or a cloth that transferred wax or dash dressing, leaves a moisture-holding film. A second pass with a clean damp cloth and a dry buff normally clears it.
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