1. Soak in hot water for a while, then you can peel it off.

2. Wipe it with essential oil, and it will fall off after a while. Give it a try.

3. You can try using an eraser. But at the beginning, you may feel that the more you wipe, the dirtier it becomes. But if you wipe for a longer time, you will see the effect. This method is relatively tiring, so you need perseverance.

4. Soak it in water, add a little detergent, and then brush it with an old toothbrush.

5. Wipe with a cloth dipped in alcohol or Erguotou.