Make a ball around the size of a tennis ball or whatever size you want. Put it in an old pair of panty hose and tie a knot. Wash in your next load using hot water. Put into the dryer, remove from panty hose when dry. I got four good sized balls out of what was left from one skein. You can add a few drops of essential oils to make your laundry smell nice. A great way to use up some odds and ends of real wool yarn.