I use a product called Magic Chalk on dark fabrics. It goes away with steam. It comes in a square or in pencil form. I also use Crayola Ultra clean and have never had a problem with them not washing out. I do avoid using the yellow. My biggest problem is marking items that won't be washed before going to their new home-some of my guild work. There are some who feel that the recipient will think the item is "used" if washed. That idea limits the use of some very effective tools.