It's a job few people want to do, let alone keep doing.
In fact, some cleaning companies are relying more and more on student labour and workers coming and going, than retaining "career cleaners", according to OCS Australasian managing director Gareth Marriott.
Despite this, Marriott said the industry employed 40,000 people in New Zealand, and injected $1 billion into the economy each year.
To stand in the work shoes of a cleaner, Marriott swapped his briefcase for a mop and a bucket this week, and joined cleaning staff for a shift at the Rotorua Central Mall.
Marriott helped scrub toilets, remove rubbish, mop floors and clear tables, from 3pm until midnight, to better understand the working conditions for the 4200 workers he oversees in New Zealand and 1000 in Australia.