TUCSONAZ.GOV LETS YOU DO THIS ONLINE!
This will take you directly to the online service on the tucsonaz.gov website.
What you need to know
You can contact the City of Tucson's Graffiti Removal Program by phone at (520) 792-City (2489) or email at firstname.lastname@example.org. More information is on their website: http://tdot.tucsonaz.gov/graffiti