If there is dry paint on the clothes, you can apply it evenly on the organic parts of the clothes with wind oil essence. After waiting for a few minutes, the paint solidifies, the paint skin is rolled up and gently torn off by hand. You can also choose to use paint thinner, which is a chemical substance that can dissolve paint to some extent. As long as you paint a little on the clothes painted by your sister, you will immediately remove the pigment from the clothes and then wash them repeatedly with clear water.