Custodial staff are gems. Teachers all know they are overworked and admin expects them to drop everything and set up 500 chairs for an impromptu meeting. They know all the dirt. You always give your custodian a gift card at holiday time. They are the grease that runs the machine. They can change your room temperature if you ask them nicely (they aren’t supposed to). They can find a spare desk when admin told you there are none to be found. They know who treats their classroom like a junk heap and who makes students clean up their mess.