I've never been able to effectively use the pounce markers. I generally use a plain #2 mechanical pencil for light fabrics and a white fine line Bohin/Sew Fine pencil for dark colors. Sometimes that just doesn't do it. Most recently I used a large barrel chalk marker - now under the Bohin brand but when I originally bought it I think it was Clover?? It came with many different colors of chalk. This last one I used the orange as I was working with green and tan fabrics and didn't want to be switching back/forth. I was also machine quilting vs hand this time so all the shoving/twisting/etc. of the sandwich through the throat of the machine was erasing much of the fine-line marking before I got to it.
In the areas where I was not overly heavy-handed with my marking, the orange washed out fine. In the areas where I was a little too heavy-handed, it took several washings and different treatments to get the markings out. But they did come out.
I'm going to have to try the washable markers at some point I think.