After solving that whole pesky homeless problem, he has announced his idea to reduce graffiti: medieval stocks:
...Goodman says he wants to put those who deface property in stocks where the public can "dab" paint on their faces as they sit with their heads and arms locked in place.
He says that, once the city attorney's office decides whether they think this amounts to cruel and unusual punishment, he wants to put the plan into action.
It's actually a lot gentler than Goodman's original proposal: cut off their thumbs.