Polishing car glass works on haze, limescale, old coating residue and the smeared arcs wipers leave behind. It will not remove scratches you can feel in the glass. Run your fingernail over it first: if it does not catch, the problem is a film on the glass and Bilt Hamber Re-View Glass Polish will bring it back to clear, even glass.
Many people search for how to remove wiper scratches when they actually mean those curved streaks in their view, mostly against the light and in the rain. Usually that is dirt and build-up dragged over the glass by the blade, and that you can fix. Real scratches in a car window need a different approach, which we explain below.
Polishing car glass: what to expect
Glass is hard, but a thin film still builds up on it: road grime, limescale from rainwater, wax residue and broken-down coating layers. A normal cleaner removes the loose dirt, an active glass polish goes deeper. We use Bilt Hamber Re-View Glass Polish for this, an active glass polish that strips films, build-up and old coatings from the glass. This is what works per problem.
Problem | What you see | Solution |
|---|---|---|
Grease and road film | Streaks and haze against the light | |
Limescale and mineral spots | White spots that stay put | Glass polish, see also the guide removing water spots and limescale |
Old coating or wiper wax | Smearing, water runs unevenly | Glass polish, then a new layer |
Light wiper marks in the build-up | Arcs, nail does not catch | Clean and glass polish |
Scratches you can feel | Nail catches | Glass polish will not repair them, have the window assessed |
Why wipers streak and scratch
Sand and fine grit get trapped between the wiper rubber and the glass and are dragged across it with every sweep. Worn rubber, dry wiping and a dead film of grease make it worse. So replace the blades as soon as they smear, otherwise the same arcs return within a few weeks. Never wipe dry over a dirty window and rinse off the coarse dirt first.
How to do it
Clean the glass. Wash the car and clean the window with Bilt Hamber Trace Less Glass Cleaner so no coarse dirt ends up under the polish. Work in the shade on cool glass, otherwise the product dries too fast.
Mask off. Tape off rubbers, plastic trim and the paint around the glass to keep things tidy. Check that it is plain glass: not for windows with aftermarket tint film and not for textured glass.
Apply the polish. Shake the bottle and take a small amount (the manufacturer mentions a pea per area of about 30 cm) on a microfibre cloth or applicator. Work one section at a time, not the whole window at once.
Work in small circles. Use calm, overlapping circular strokes. A polisher is quicker, in which case mist the glass lightly with water now and then so the polish does not dry out. Tip: by hand works too, it just takes longer.
Wipe off. Rinse the residue away while it is still wet, or buff it off with a clean, dry microfibre cloth. Swap cloths as soon as one is full.
Test with water. Spray water on the treated spot. An even, flat film of water means clean glass. If the water beads or breaks up, repeat the step on that spot.
Finish and protect. Clean the window afterwards with Koch Chemie GC Glass Cleaner or Bilt Hamber Trace Less Glass Cleaner and apply a new water-repellent layer with D-CON Ceramic Glass Clean & Protect. The polish removes old coating, so protect the glass again.
Glass products we use
Bilt Hamber Re-View Glass Polish is the product for build-up, mineral spots, oil film and residue from old coatings. You will find it in glass polish and anti-fog. Use it on untreated glass and, if in doubt, try a small spot first.
Bilt Hamber Trace Less Glass Cleaner cleans without streaks and leaves a glass coating intact, so you can clean the glass before and after polishing. More glass cleaners are in glass cleaners.
D-CON Ceramic Glass Clean & Protect cleans the glass and lays down a ceramic, water-repellent layer in one go. A handy last step after polishing, see glass coatings.
Koch Chemie GC Glass Cleaner is a ready-to-use, ammonia-free, alcohol-based glass cleaner for everyday upkeep, also safe on tinted windows and ceramic-coated glass.
Upkeep after polishing
Keep the result clear with a good cleaning routine. How to do that without streaks is in the guide cleaning car glass without streaks. Use clean microfibre cloths, spray the cleaner on the cloth and not on the dashboard, and clean inside and outside equally often. Check the wiper blades after winter and replace them if they judder or leave arcs.