I use the graphite and white ceramic leads that come with the Sew Line pencil in my business as a LA quilter. I also use the blue water-soluble pens. White chalk is a bit more difficult to get off, but it does wash out. When I used the yellow and blue chalks they NEVER came out, even after washing, so I threw them away. There are also pens that disappear with heat or steam, like Frixon pens that ckcowl mentioned - really nice! Do try whatever you are going use to mark on a quilt on a scrap of that material first just to make sure it really does go away. A friend uses Crayola washable markers on her quilts and they always disappear when washed.