Okay, I know I'm monumentally too late for this one but...
The best, best, best way of removing permanent marker from a wipe board is to use a rubber - just a normal eraser that you'd use to get rid of pencil marks on paper - to remove the ink and then clean the wipe board in the way that you usually do. It leaves no marks and no residue. Done!
You'd be amazed how often I need to do this after Exec meetings

ha!