Someone driving the washing machine

At six in the morning, as the first subway train cuts through the city's silence, Mr. Li, a cleaner at a Shanghai metro station, is already pushing a silver-gray floor scrubber through every corner of the station hall. Accompanied by the gentle hum of the machine, stubborn shoe prints, scattered paper scraps, and sticky drink stains disappear in an instant. The polished marble floor reflects the hurried figures passing by, like a flowing mirror. "Stains that used to take a dozen swipes with a mop to clean are now gone with a single push," Mr. Li says with a smile, wiping the sweat from his brow. This is the cleaning revolution that walk-behind scrubbers have brought to modern transportation hubs — efficient, intelligent, and quietly transformative.