Go to Office Max and buy some "Frixion" pens by Pilot! totally awesome. Marks totally disappear when heat is applied and reappear when item is placed in a freezer. I just did a huge double wedding ring quilt. to restore the marks for quilting, I placed the pressed top in the freezer overnight. To remove the marks so I'm certain they're gone, I use "Shout" spray. Works every time. Only caution: I don't use the red pen as the red doesn't completely come out in the first washing. The blue and black pens are fine. Marks come out great.