I have my hair cut at home. What if hair clipper's blade is unhappy?

Materials required: toothbrush, sander, magnet.

1. First remove the blade of the electric hair clipper, as shown in the figure below.

2. Then clean the hair on the blade with a toothbrush. In order to prevent being cut, it is best to wear thick gloves, as shown in the figure below.

3. Then, turn on the grinder of the electric clipper blade and pour the grinding powder evenly, as shown in the figure below.

4. Finally, grind it back and forth on the grinder until the blade becomes sharp, as shown in the figure below.