1, you can wipe the dirty place with strong brine, or you can immediately sprinkle salt on the dirty place, rub it gently with your hands, moisten it with water and soak it in detergent and solution.

2, can be washed off with warm water and soap.

3. It can be washed with hydrogen peroxide for a long time, and then washed with white vinegar.

4. You can find some fine sand mixed washing powder to remove the color on your hands.

5. essential balm is an organic solvent, which has a certain decoloring effect. Pigment in walnut skin can be dissolved with essential oil.

6, bleaching powder. You can use bleach to clean the cup, or you can clean walnut juice. Note: bleaching powder is dangerous, so it must be used carefully and scientifically.