Cashmere is a type of wool that is taken from the undercoat of cashmere goats. Cashmere sweaters are popular because they are soft, lightweight and insulating. They can be expensive, so it is important to take care of them properly to extend their life.The best way to clean a cashmere sweater is by hand washing it in cool water with a gentle detergent. Dawn dishwashing soap is a good choice because it is effective at removing oil and grease. Be sure to rinse the sweater well and squeeze out as much water as possible before hanging it to dry.If you must machine wash your cashmere sweater, use the gentle or Wool cycle and a mild detergent. Be sure to place the sweater in a mesh laundry bag to protect it from being stretched or torn. air-dry only