Clorox bleach- kills most bacteria but is ineffective if organic debris is present. Clorox does not work against mycobacterium. Nolvasan- does not work against Pseudomas bacteria or mycobacterium. Good management of cockatiels should also include care of the wings and feet. By this, I mean wing clipping and nail clipping.
Most cockatiels are very muscular in their shoulders and have the capacity for strong flight.
Because of this, any cockatiel kept as a pet should have their wings clipped. Rarely does this render the bird completely flightless, but it will prevent strong flight in an upward pattern. It is impossible for you to retrieve a lost bird once this happens. Also, once a cockatiel is clipped, it is not permanent. Be aware of new growth among the flight feathers and trim accordingly.