Just a few examples from a simple Google search:
Graffiti Buster: http://www.troyweb.com/graffiti-buster/
Since the days of Ancient Greece and the Roman Empire, graffiti has adorned the walls of our urban neighborhoods. In modern times, spray paint and marker pens have become the most commonly used graffiti materials. Graffiti is a quality-of-life issue that can result in costly cleanup and lowered property values. It generates the perception of blight. The appearance of graffiti is often perceived by residents and passers-by as a sign that a downward spiral in a neighborhood has begun, even though this may not be true.
The Graffiti Buster App was created as another tool to combat blighting graffiti in our neighborhoods. With the app, the reporting of graffiti is now streamlined, providing all needed information directly to municipal authorities. Reporting graffiti for cleanup is now as easy as a snap of a photograph and push of a button!
San Francisco: On the SF311, (http://www.sf311.org/index.aspx?page=797) you can submit requests for:
Abandoned Vehicles, Graffiti, Illegal Postings, Street or Sidewalk Cleaning, Streetlight Repair, Blocked Sidewalk or Space, Damaged Public Property, Litter Receptacle, Park Issue, Sign Repair, Street and Sidewalk Defect, and Tree Maintenance.