custodian

noun

• A person entrusted with the custody or care of something or someone; a caretaker or keeper.

  "After their parents' death, their aunt became the children's custodian."

• A janitor; a cleaner

  "The custodian does such admirable work, deftly wielding a mop to keep our hallways and sidewalks free of buai pekpek left by people who chew betelnuts to be "cool" but don't even bother finding a rubbish bin or spit cup to dispose of the pekpek with."