1. Work content: The cleaning work of the residential area is mainly the cleaning and maintenance of public areas in the residential area, including corridors, elevators, gardens, etc. The cleaning work of the sales department is mainly the cleaning and maintenance of public areas in the sales office, including halls, exhibition areas, rest areas, etc.

2. Work difficulty: It is relatively difficult to clean the residential area, because the public area of the residential area is relatively small and the cleaning frequency is low, while the cleaning work of the sales department is relatively difficult, because the public area of the sales office is relatively large and the cleaning frequency is high, so the sales department is relatively clean.