This was an odd one – for the London 2012 Olympic Games, I was asked by Proctor and Gamble to publicise their “Cleam Up London” campaign by drawing a picture – not with pens and paper, but by wiping dirt off a manky tube station wall (although the wall was just a reproduction one built in a studio).  There were twelve of us doing this in shifts and the results were photographed and used in an exhibition in London’s Brick Lane.