One of the traditions of the Japanese education system is that students do o-soji(cleaning). However, it’s been in print more than once that Japanese schools have no janitors because students do all the cleaning. That’s simply not true.
Japanese schools have non-teaching staff called yomushuji , or shuji for short. They have many responsibilities, including serving as crossing guards when school lets out, but their main job is cleaning and maintenance. That’s a good thing, too, when you take a moment to think about. Schools definitely need adults to mop things up after the children finish cleaning.