Methods are as follows:

1, with hand sanitizer. First of all, the hand will be rinsed with water; then in the hands of the appropriate amount of drops of hand sanitizer; after repeated hand rubbing, hands up and down repeatedly rubbed until clean; finally rinsed repeatedly with water can be clean.

2, white vinegar cleaning. First of all, wash and dry your hands; then take out the right amount of white vinegar; after that, put the right amount of white vinegar drops in the hands with black spots; wait for a while, gently rub the stained parts with your hands; finally rub it clean and then wash it with water.

3, soap and water cleaning. First wet the stained fingers; and then the soap applied to the stained areas, more scrubbing a few times; and then rinse with water; and finally check, if the effect is not obvious, you can wash a few more times.

4, baking soda cleaning. Put your hands in the diluted baking soda and wash repeatedly, using acid and alkali neutralization decontamination.

5, fine sand mixed with washing powder water. Hands cupped sand rubbed back and forth with each other, the use of sand friction will remove the black material.

6, windex cleaning. Windex is a good organic solvent, coated in the hands can be very good to help dissolve the walnut stained parts, has a very good cleaning effect. Use a cotton swab dipped in an appropriate amount of essential oil to smear on the stained hands. Then rub your hands and leave it for some time. Until you can visibly see the color lighten. Finally in the use of alcohol or gasoline to clean up can be.