I have actually used contact paper for the pattern, quilt around it and you can move it and use it over and over. Otherwise I use the wash out pens, but just spray and dab out the color as I go. I don't usually wash my quilts after either. But don't just spray it will reappear.
Try the glad press and seal, my friend uses it all the time.
You can mark on it, machine quilt trough it and then just pull it away.