I have not had the Ultra markers fail me so far. I use them to mark all quilting lines and many have been on the quilt top for months before I finished and all the color has washed out. But you never know when one batch of one color got a little more pigment then before. But it is made to wash out so another wash with soak should take the color out. I wouldn't put any detergent in with only a few spots to get out. Put Dawn on the spots.