Southwest's F/As are willing to strike because they dont get paid to clean planes and Southwest does not have PART TIME and Southwest does have cleaners at certain stations.
Plus Southwest does not have banks of flights, like the legacy carriers do, so when you have 40 planes on the ground at the same time you will need more bodies to work them, plus Southwest does not interline bags as the legacy carriers do.
You have to compare Apples to Apples not Apples to Oranges.
http://www.iflyswa.com/careers/mxairclean.html
Southwest Airlines Maintenance Department
Aircraft Appearance Technicians
Job Position: Aircraft Appearance Technicians
Job Functions:
The position requires cleaning of interior and exterior of an aircraft, company vehicles and facilities, as required to maintain a clean and healthy aircraft to keep our passengers returning for travel on Southwest Airlines.
Cleaning interior of aircraft, including galleys and lavatories.
Wash or wax aircraft exterior, including landing gears, etc.
Replacement of aircraft carpet and seat covers (backs and bottoms).
Servicing of aircraft lavatories.
Driving tugs, fork lifts, and passenger vehicles.
Exposed to fumes from chemicals, noise from aircraft engines and APUs, and danger around aircraft standing and lifting containers up to 50 pounds.