Once again, to be very clear, it’s a year long job. There’s a big push in fall before students move in (it’s a paid pre-orientation choice, where the others are not paid or cost money) and again in spring when students move out, but dorm crew cleans individual student bathrooms all year long.
This may not change your opinion, but this idea that it’s only before/after the school year has popped up more than a couple of times in this thread and it is not correct.