Are you the janitor? I would say this was some dumb kids partying, but it is Maine, they were probably in their 40’s . Anyway, nobody asked you to go to the school and clean it up. As much as it suck for the maintenance guy, that is why he gets paid.
But kudos to you for going on a swap and sell page to congratulate yourself for a job well done and look to other to also thank you. I am positive the vandalize will be be happy you taught them they need to be more respectful.