In this Chapter, unless the context otherwise requires,

(24b) "cleaning activity" means cleaning, including specialised cleaning services such as disinfecting, exterminating or sterilising of objects or premises, of-

( i) commercial or industrial buildings and premises thereof; or

( ii) factory, plant or machinery, tank or reservoir of such commercial or industrial buildings and premises thereof, but does not include such services in relation to agriculture, horticulture, animal husbandry or dairying;