2. Turn the blinds upside down and tear the white film.
3. Remove the fat oil on it.
4. Put three or five spoonfuls of salt and proper amount of oil on the louver, and grasp it evenly by hand. Repeat it several times like rubbing clothes. You can also burn off the black or brown epidermis with boiling water, then put it in a basin, add baking soda and rub it hard.
5. Rinse with clear water until the odor is eliminated.
6. Wash all impurities with clear water and cut into pieces.