Streak-Free Car Glass: The Secret Isn't the Cleaner
Why your windscreen streaks after every clean, the correct two-towel method, and what causes night-time glare.
The most common complaint we hear about glass: "I cleaned it and now it's worse." In nine cases out of ten the cleaner isn't the problem — the towel and the timing are.
Why streaks appear
- Towels washed with fabric softener. Softener leaves a waxy film that smears glass. Glass towels are laundered without it, ever.
- Working in direct sun. The cleaner dries before you can buff it.
- Too much product. Two sprays per window is enough.
- An oily film inside from plastic off-gassing and AC vapour — this needs two passes, not one.
The method we use
- Clean exterior glass after washing the car, not before.
- Use two towels: one to clean, one bone-dry to buff.
- Wipe exterior glass horizontally and interior vertically — then you know which side a streak is on.
- Lower the window slightly to clean the top edge that hides in the seal.
- Don't forget mirrors and the reversing camera lens.
Night glare
If oncoming headlights scatter at night, the usual cause is that interior film on the windscreen from heat and plastic off-gassing — not your eyes or your headlights. Cleaning it properly fixes the problem immediately and is a genuine safety improvement.
Wipers
Wiping the blade edge with an alcohol-damp towel once a month doubles its life and prevents streaking. If a blade chatters or squeals, it's finished — no cleaner revives hardened rubber.
Clean glass isn't cosmetic. It's the fastest safety upgrade available to any driver.
