Cleaners work behind barriers to remove graffiti from the facade of The National Gallery in Trafalgar Square, London,  Monday June 29, 2009, after fans of Michael Jackson defaced the wall of the ancient art gallery following the death of the star. The death of pop singer Michael Jackson prompted many fans to gather in the central London square and some left commemorative graffiti messages on the wall of the National Gallery which are now being removed by specialist cleaners. AP Photo logo AP Photo 4 months ago

Cleaners work behind barriers to remove graffiti from the facade of The National Gallery in Trafalgar Square, London, Monday June 29, 2009, after fans of Michael Jackson defaced the wall of the ancient art gallery following the death of the star. The death of pop singer Michael Jackson prompted many fans to gather in the central London square and some left commemorative graffiti messages on the wall of the National Gallery which are now being removed by specialist cleaners.