I just made an amazing discovery. I have in my office a whiteboard, upon which I used permanent marker by accident about 3 months ago. Usually when I make this mistake I have to resort to various cleaning agents and an abrasive cloth and lots of elbow grease to get rid of the offending items. However I have discovered that if you rub whiteboard marker over the top of the permanent stuff you can then just wipe it of with a cloth. Dont believe me? Try it. Anyone got the GEMS contact details?