It is 11 a.m. on a weekday in late June in Amsterdam’s De Wallen district, and a clean-up operation is underway. Street sweeping machines are collecting trash that hints at a raucous time the night before: cigarette packs, spliff butts, and empty cannabis baggies litter the narrow alleyways. City workers armed with hoses and brushes scrub at graffiti, navigating past windows draped with red curtains where sex workers are starting their early shifts. Given the huge number of daily visitors to what’s better known as the Red Light District—Amsterdam’s iconic area with a reputation for hedonism—it won’t be long before the street sweepers are back.