My pieces may be washed by hand , of course , but I prefer washing them in the machine . Use the wool program ( cold or 30 degrees ) and make sure you only put one large or two small pieces in at a time . You may use woolite or equivalent or everyday shampoo . Spin and leave to dry flat . Only use the tumble-dryer if you wish to shrink your garment a bit . I recommend ironing your sweater with steam to make it look like new !