The next trend in graffiti, after aerosol art, stencil art and pasted-on designs, involves
selectively cleaning grimy walls. It's much like stencil art, only rather than applying aerosol paint, the artist uses solvent and scrubs a shaped area of the wall clean, creating a distinct image. And, led by the apparent legality of cleaning public surfaces, guerilla advertisers are getting onboard; some chap in Leeds named "Moose" has been commissioned by Diageo to advertise Smirnoff vodka in this fashion. The Leeds City Council, however, doesn't quite see it that way.