How do you fix yellowing car headlights?

We often encounter the problem of yellowing headlights, which leads to reduced illumination and difficulty in seeing, especially in winter. However, you can solve this problem very easily:

1. Place a wide piece of adhesive paper around the lamp.
2. Sand the lamp thoroughly using 1500 grit (very fine) sandpaper. The process may take five minutes or less, but you will find that a lot of dirt will start to come out.
3. After finishing, polish the lamp with metal polish by spreading the material on it, and then rubbing it well until it is gone.