Since I don't know what brand pencil you're using, I hesitate to say. But...the one I have simply says "Water Eraseable Fabric Marking Pen". I can usually lightly spritz and it disappears. Sometimes the color returns and I find that more water will remove it. It seems to require enough to really wet it and then the color will disappear permanently. Be sure to not iron it until all the color is removed or you may have to live with it.