Three categories, not two
Most practices think in terms of what the cleaner does and what staff do. A third category is more useful: surfaces nobody should touch without instruction. Equipment, instrument trays, anything under a clinical protocol and anything connected to a device belongs there. Naming that category explicitly is what prevents a well-meaning cleaner wiping something that should have been left alone, and it removes any ambiguity for relief staff who do not know the practice.
With three categories, the scope becomes straightforward to write. Contractor tasks cover floors, waiting and reception areas, corridors, amenities, kitchen, general horizontal surfaces and waste removal to a nominated point. Practice tasks cover treatment surfaces and anything requiring clinical process. The excluded category is listed by name. A new cleaner can read all three in a few minutes and act correctly on their first attendance.
