At a set time every day after lunch break, or after the end of the day's lessons, everyone begins cleaning the school in unison. Groups of students are in charge of the cleaning in different parts of the school, i.e. classrooms, toilet, corridor and so on. Inside the classroom, students move the desks, sweep and mop the floorand wipe the desks and blackboard with a 'zoukin' (a square, stitched kind of small towel).