Cleaning an office doesn't take 40 hours a week, so it makes more sense that a cleaning company hires full time people and contracts with multiple offices. The

Cleaning an office doesn't take 40 hours a week, so it makes more sense that a cleaning company hires full time people and contracts with multiple offices. The alternative is each office hiring individuals for a few hours worth each week and dealing with high turnover rate because the cleaners would surely prefer other jobs with more hours than doing the administrative work of a cleaning company on top of the cleaning work for no extra pay.