I've had success with the Water Erasable Fabric Marking Pen. I don't know who makes it because that is the only wording on the pen that I'm looking at right now. I bought it at a local quilt shop on their advice. It disappears with even a spritz of water from a spray bottle. The color I have is blue..not sure if it comes in other colors. The quilt I'm working on is light, so not sure how this would work on darker colors.