Vacuum Groove central stair access door. Building 1-2 wiping fire escape vents Building 2 (2 sides) clean the walls around the spring in front of the building.
Vacuum Door - the central staircase. 1-2 Building Duct cleaning stairs, Building 2 (the two sides). cleaning walls around the fountain in front of building.
Dust suction groove entrance - the main stairwell. The building 1-2 wipe vent stairs, building 2 (both side) 2 clean surrounding wall fountain in front of the building