Marking white fabric is the most challenging of all. And the white on white is more difficult yet because of the printing process. I like to use the Crayola washable markers (fine tip). I have never had a problem washing it out with just warm water in the washing machine. I also like to do designs on paper and just tear it away. The bits that sometimes get left behind also wash away. I have used Golden Threads but I prefer a paper that I get in the office supply store that is 12 inches by 20 yards or so. I just cut it to the width I need and draw on it, pin it to my quilt, stitch, tear it off and wash. Works well for me.To do a border I tape the strips together and draw the design. I can easily adjust the border length so it fits and the pattern fits perfectly.