To clean the inside of your windscreen without streaks, work on cool glass, apply a little Auto Glanz Moonshine to a clean glass cloth, then finish with a separate dry cloth. Clean one section at a time and fold the cloth more as it picks up residue. If a smear returns, remove the film with a fresh cloth rather than adding more cleaner over it.
The inside of a windscreen can look clear in the garage, then reveal a greasy haze when low winter sun or headlights catch it. Our method keeps the product controlled, lifts the film away and makes it easier to spot any areas you have missed.
What you need
- Auto Glanz Moonshine glass cleaner, formulated for interior and exterior automotive glass.
- At least two clean, dedicated AutoGlanz Glass Cleaning Cloths: one for cleaning and another kept dry for the final finish.
- A spare cloth if the windscreen is heavily marked.
- Good light and enough room to reach the glass comfortably.
Moonshine cuts through greasy film and fingerprints, then flashes off quickly. Our dense-fibre glass cloths help you lift residue and finish the surface without reaching for a towel that has already been used with polish, wax or an interior dressing.
How to clean your interior windscreen, step by step
1. Park up and let the glass cool
Work with the vehicle stationary, out of direct sunlight where possible. Let hot glass cool before starting. Follow the product label and work with ventilation. Make sure the dashboard and surrounding areas are free of loose dust so you do not transfer it straight back onto the glass.
If the screen has tint film, an interior coating or another applied treatment, check that treatment's cleaning instructions first. Moonshine's suitability for automotive glass does not establish compatibility with every film or applied surface.
2. Fold your cleaning cloth and keep a finishing cloth aside
Fold a dedicated glass cloth into a manageable pad. This gives you several clean faces to rotate through as you work. Keep your second cloth dry and away from any overspray.
A cloth that feels clean can still contain dressing or fabric-conditioner residue. If it has been used around the dashboard or with a finishing product, choose another one for glass. Our microfibre washing and care guide explains how to keep your cloths ready for their next job.
3. Apply Moonshine to the cloth
Inside the vehicle, we recommend applying Moonshine to your cleaning cloth rather than spraying towards the windscreen. This helps keep the cleaner off the dashboard, screens, vents and surrounding trim.
Use enough to clean the section you are working on without soaking the cloth. A saturated cloth makes it harder to remove the liquid and contamination cleanly. Keep the product on the intended glass surface and follow the current bottle directions.
4. Clean in small, overlapping sections
Work across one half of the windscreen at a time, using overlapping passes so you cover the whole area. Include the corners, the glass near the mirror and the lower edge where the screen meets the dashboard.
Use light, controlled pressure. Turn to a fresh cloth face when the current one starts carrying residue. If access is awkward, approach from the passenger side or change your position rather than stretching hard against the dashboard or leaning on delicate trim.
5. Finish with a separate dry cloth
Allow Moonshine to flash off as directed, then use your clean, dry finishing cloth to remove the remaining residue and leave the glass clear. Work methodically over the cleaned section, including its edges.
If the finishing cloth becomes damp or starts dragging a film around, swap it for a dry one. More pressure and repeated buffing with the same loaded cloth will not remove contamination that is being spread back onto the screen.
6. Check from more than one angle
Inspect the windscreen from both seats and from outside the car. Light from a different angle often reveals a missed corner or a narrow band along the bottom edge. Clean any remaining marks with a fresh cloth face, then finish again.
For a useful final check, clean the inside with vertical finishing passes and the outside with horizontal passes. The direction of any remaining streak can help you identify which side needs attention. Make sure your view is clear before driving.
Why does the windscreen still look smeary?
- A broad greasy haze: repeat the cleaning stage with a fresh cloth. The first pass may have loosened the film without removing all of it.
- Streaks following your cloth: check whether the cloth is damp, loaded with dirt or carrying residue from another product. Change it before adding more cleaner.
- Cleaner drying before you can finish: let the glass cool, move out of direct sun and work a smaller section.
- A clear centre but marked edges: revisit the lower edge and corners with controlled passes. These areas are easy to miss.
- Marks that remain after cleaning inside: inspect the outside too. Exterior dirt, water marks or damage need a different diagnosis from an interior cleaning smear.
Which Auto Glanz glass product should you use inside?
For this routine, our choice is Moonshine: it is a dedicated cleaner for interior and exterior glass, with a fast-flashing formula that tackles oily residue.
Vision combines exterior glass cleaning with water-repellent protection. Keep that exterior protection step separate from cleaning the inside of the windscreen. If you want more help choosing a cleaner and cloth combination, read what makes a good car glass cleaner.
Frequently asked questions
Should I spray glass cleaner onto the inside of the windscreen?
Moonshine's directions allow application to the glass or a dedicated cloth. Inside the car, applying it to the cloth gives you better control around the dashboard, electronics and trim.
Why do I need two glass cloths?
The first cloth handles the cleaner and loosened film. A separate dry cloth gives you a clean finishing surface, instead of asking one damp cloth to do both jobs. Use extra cloths whenever the originals become loaded.
Will cleaning stop my windscreen misting up?
This is a glass-cleaning routine, not an anti-mist treatment. Cleaning removes surface film, but condensation also depends on moisture and temperature in the vehicle. Use the vehicle's demisting controls as directed; recurring dampness needs attention beyond cleaning the glass.
How often should I clean the inside?
Check it as part of your regular interior clean and whenever haze, fingerprints or smears appear. Clean according to the condition of the glass rather than waiting for a fixed interval.
For your next interior detail, pair Moonshine with our dedicated glass cloths, keep a dry cloth ready and give the edges the same attention as the centre.
