Wool clothes shrink and deform easily, so it's best to dry clean them. You can wash it yourself, but be careful. Sweater detergent should be dissolved in water first, then the clothes should be immersed in water, and then gently rubbed by hand. After washing with water, press the water out by hand. Don't wring or spin dry with the washing machine, because it will wrinkle or even deform the clothes. Finally, it should be flat when it is cold, and it is best to use a clothesline. When it's dry, iron it and put it in the closet.