Blueberries can be washed with soap and salt after they are put on clothes. The steps are as follows:

Tools: toothbrush, soap, salt and water.

1. Sprinkle a proper amount of salt on the clothes where blueberry juice is made.

2. Dip the discarded toothbrush in a small amount of water and brush the blueberry juice evenly.

3. Dip the soap in a little water and spread it evenly on the clothes with blueberry juice, not too much.

4. Dip your toothbrush in water and brush blueberry juice again for about 3 minutes.

5. Finally, wash it with clear water, wring it out and dry it in the sun.