It starts on the platform. As passengers step off, the cleaners bow, thank them and take their trash. That part takes about a minute and a half.
Then they go in. In 30 seconds, every seat in the car is turned to face the direction the train will travel next.
The next four minutes go to wiping tables and windows, sweeping and cleaning the floor and changing headrest covers. The last minute is a check, including a search for anything passengers left behind.
A 17-car train takes 44 cleaners in two teams. At Tokyo Station, they do it for about 120 trains a day, and up to 168 in the busiest season. One of their leaders compared it to cleaning six Boeing 737s in less than half the usual time.