Few buildings are used as intensely as a school or an early learning centre. Every tap, bubbler, door handle and desk is handled by dozens of children a day, and the youngest put their fingers in their mouths a moment later. A missed clean is noticed quickly, often by a parent at the gate.
Business managers, principals and centre directors have another question to answer: who is in the building after dark? Families and staff expect the people cleaning classrooms to be checked, consistent and supervised, not a different stranger each fortnight.
Then the calendar gets in the way. Holiday breaks are the only time for proper floor, carpet and window work. Leave the planning too late and the job slips into next term, with children back in the rooms.