Differant contractors for differant areas.
They will look after all there cleaning from polishing, carpet cleaning to windows.
You could always ask them you might get some joy.
I have just cleaned the carpets in a bank should have been done by the cleaning company thats recommended by head office but I know the manager and they paid me immedately and claimed ingnorance.
The problem with banks most of them have a high turn over of managers so they don't look after the cleaning and leave that to another department.
Rob.