My Classroom is Dirty

In what other industries are employees expected to work in an unclean environment? The floor in my classroom is filthy. The shelves are covered in dust. The countertops and tabletops have visible gook and schmegma. I already have to purchase my own printer ink, printer paper, pencils, erasers, pencil sharpeners, etc. Do I need to hire my own cleaning service as well?

It is not the custodian's fault. The real problem is that there are not enough custodians available to adequately clean the entire school. And that is because there isn't enough money in the budget to hire an appropriate amount of custodians to actually keep the classrooms clean.

So until the day comes when we choose the cleanliness of our classrooms as a priority...well, I guess I'll just exist in the filth.