Cleaning is the process of removing unwanted substances, such as dirt, infectious agents, and other impurities, from an object or environment. A cleaner, or Custodian, is responsible for keeping offices, homes, hotels or other public areas neat and organized. Their main duties include sweeping, mopping and vacuuming floors, dusting countertops, ceilings and furniture and sanitizing bathrooms, kitchens or other public areas. Build a Job Description. Cleaning, stocking and supplying designated facility areas (dusting, sweeping, vacuuming, mopping, cleaning ceiling vents, restroom cleaning etc) Performing and documenting routine inspection and maintenance activities. Carry out heavy cleaning tasks and special projects.