Final answer:
Demand cleaning is done in response to a specific need, while pre-cleaning is a preparatory step before the main cleaning or disinfection process.
Step-by-step explanation:
Demand cleaning refers to a cleaning process that is performed only when needed, in response to a specific problem or request. It is focused on addressing a particular issue or situation.
Pre-cleaning, on the other hand, is a cleaning process that is conducted prior to the main cleaning or disinfection procedure. It is done to remove visible dirt, debris, and contaminants before the actual cleaning process.
So, the main difference between demand cleaning and pre-cleaning lies in their purpose and timing. Demand cleaning is done in response to a specific need, while pre-cleaning is a preparatory step before the main cleaning or disinfection process.
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