I use a #2 mechanical pencil as well. For dark fabrics I use a Bohin mechanical pencil with white lead. Only one time did I have an issue with the #2 pencil washing out. It was on white fabric and I think I marked too darkly. In addition I had changed my mind as to quilting design so there was much not covered with thread. Not unlike the one I just finished today. I, too, have learned to not be so heavy handed and generally don't have an issue. On the one with the lines on white fabric, a bit of Dawn dish soap and a toothbrush took care of the issue.