Hey assholes, sooner or later someone has to wash the smell of dirty hippy crotch out of the place. If they didn't, you'd be complaining about "the intolerable conditions" NYC is forcing you to protest under.
Besides, isn't that private property to begin with? You're lucky to even have a nest to foul. If I owned Zucotti Park I'd have already hired my own Blackwater bouncers to dropkick your asses out of there.
Actually, I could probably get a troop of Brownies to do it, and cheaper, but I believe in hiring veterans.