Web Urbanist has an article showing the way reverse graffiti is now being used for marketing and its completely legal. Reverse Graffiti is cleaning walls with soup to create artwork. I’m sure if anyone other then advertisers were pulling this off the police would find some way to charge someone for washing walls. Paul Curtis aka Moose, a British artist that was one of the first people to start Reverse Graffiti. In that case authorities had seen this as vandalism.
