Medical sewer and drain cleaning. Shut sinks done on the 4th and 5th, and 6th floors total of 6. Go to the men’s Doctors' locker room, find the waste line, and run hot water in the sink above to verify this is the waste line. The cast iron (CI) line is 2” and gets hot. It is the line. Remove the CI nohub wye combo, hold on to the rod, and put it into the grey tray to stop the room from getting messed up with black waste junk. Clean the area, reinstall the CI combo, and run a water check for leaks. The sewer line is flowing safely now.