First, use essential oils. Apply essential balm to the place where walnut juice is on your hand, and walnut juice can wash it off quickly.

Second, use salt. Apply salt to the hands stained with walnut juice, then dip them in water to moisten them. After a few minutes, wash your hands with soap and wash off the walnut juice on your hands.

Third, use soap. You can also apply soap to the part of your hand stained with walnut juice, and then rub it repeatedly by hand to wash off walnut juice.

Fourth, use grapes. Crush a grape, too, and smear it on the place stained with walnut juice. Keep rubbing, and the fruit acid in the grapes will slowly dissolve walnut juice.