a uniformed janitor pushes a rolling cart filled with cleaning supplies down the hallway. He stops to mop the floor with professional equipment while his cart holds spray bottles, towels, and cleaning tools. The freshly mopped sections of the floor gleam with cleanliness compared to the areas not yet cleaned. Office workers walk carefully around the wet floor area, acknowledging the maintenance work in progress. A supervisor nearby checks off items on a maintenance checklist while observing the cleaning process. the work of cleaning and maintaining a building