A couple of years ago I walked down Bourbon street shortly after a parade went through. The crews were working hard but because the parade had just went through it was nasty. Vomit and urine smells, trash everywhere. However, with in about an hour the cleaning crews had that place cleaned up and smelling nice. I don’t know how they did it, must be a science to getting rid of the stench so quickly.
Two things they can do in New Orleans.
Control a crowd
Clean up the puke, litter and plastic beads from the street.
I never go near the Quarter during Mardi Gras season.