San Francisco Wants Advertisers to Stop Cleaning the City

"Reverse graffiti," a trick used to draw art or advertising into filthy city surfaces, is a trend we've been watching for a few years now. And while some like the idea of advertising that actually makes the world a bit cleaner, San Francisco regulators appear to be cracking down on what they see as unlawful marketing in a public right-of-way. In the news clip below, reverse graffiti pioneers GreenGraffiti make the case that they're providing a service, one that cities could theoretically monetize to help support schools and other government programs.