To clean the black stains from raw walnuts on your hands, you need to prepare: a fresh lemon, a bowl of rice water, a pack of paper towels, and a cutter. The specific cleaning method is as follows:

1. First cut the fresh lemon. The specific operation is as follows.

2. Next, squeeze out the juice from the fresh lemon and apply the juice to the black juice stains on the raw walnuts on your hands.

3. Next, take out the rice water and pour the rice water on the black juice of the raw walnuts on your hands to clean it.

4. At this time, just dry the cleaned hands with paper towels. See the picture below for details.

5. Finally, take a look at the effect after the treatment. The black juice of the raw walnuts on your hands has been cleaned, as shown in the figure.