The way of sweater hand washing is to prepare warm water with 30 degrees Celsius to 50 degrees Celsius, add detergent, put the sweater in the water, soak for 15-20 minutes.squeeze it lightly with your hands, do not rub it vigorously, It will make the sweater deform, then dry the water,wash it many times, wash the foam.squeeze the excess water out with your hands, and hang it dry.