Each night dozens of trucks carrying 15 people depart from Mexico City’s downtown to Francisco I Madero Avenue, the most famous pedestrian street in the capital. Armed with 90C vapour guns called Terminators, the group begins the laborious task of combing the street looking for small, black circles fastened to the ground.
It takes them three days, working in eight-hour shifts, to go through the 9,000 sq metre avenue. By the end, they have removed a total of 11,000 pieces of chewing gum
There’s a sense of resignation among the workers. Many are single mothers who commute an hour and a half from the city’s outskirts to perform this tedious work until 5am. “It gets boring,” says one of the most experienced.