Custodians are typically employed by office parks, schools and any other facilities that need frequent maintenance and upkeep. They clean up spills caused by food or beverages, wash windows, mop floors, wipe tables, replace air filters and maintain a trash and recycling removal schedule in accordance with local pickup times. Their job is to uphold the health and safety of a building’s occupants by ensuring proper sanitation and completing chores. They may also complete outdoor chores including mowing green spaces, trimming bushes and power-washing walls, windows and sidewalks.