Why is the window glass scratched when rolling up and down?
3 Answers
Window glass gets scratched during rolling due to sand and dirt in the rubber seals above the window, causing friction that scratches the glass. Here are relevant details: 1. Car side windows are made of tempered glass with high hardness. Scratches on side windows are usually caused by debris between the water deflector seals and the glass, such as sand, dust, or particulate matter falling into the seal grooves. 2. Normally, removing foreign objects from the car window water deflector seals and applying seal lubricant or replacing the seals can prevent window glass from being scratched.
After driving for a long time, I noticed that the car windows get scratched easily during operation because sand and dust accumulate in the track gaps. Every time the window is rolled up or down, the glass rubs against these hard particles, causing annoying scratches—especially after driving on muddy roads in the rain, the problem worsens. Additionally, when the sealing strips age, they harden and become rough, further accelerating the scratches. To mitigate this, I make it a habit to clean the tracks with a damp cloth and apply spray lubricant monthly. Otherwise, deep scratches can impair visibility and compromise safety. Regular maintenance is essential—don’t slack off!
When I first bought my car, the windows mysteriously got scratched. I initially thought it was a glass quality issue, but later I realized that dust and grit in the tracks were the culprits. They got stuck in the narrow gaps and wore down the glass surface as the windows moved up and down. This is especially common in areas with heavy wind and sand, or when parking or driving on poor road conditions. Now, after washing my car, I always check the seals and clean the tracks to avoid similar problems.
