Any truth to that?
In the early 60’s students cleaned the classrooms at the Catholic grade school I attended. I have no recollection of outside custodial help. Parents painted — lead paint. :)
But, yes, the kids are expected to do the basic stuff in cleaning up the classrooms. A couple of thick dust and cleaning rags roughly one foot square is part of their required school equipment.
At the end of the day, the desks and chairs are stacked and put back in one corner of the room and every kid gets out their rag and cleans their assigned area. This can include the floor, windows and blackboards. Their HAN even gets a turn cleaning the loo. Oh, the inhumanity!