There are several processes used to explain the removal of dirts or contaminants from surface, but the general name is called Cleaning
Cleaning is an umbrella name that involves the removal of visible soils mater from surfaces, there are other types of cleaning that involves the removal of non-visible matter from surface too e.g sterilisation.
Sterilisation refers to specific action taken to reduce the hazard posed by such contaminants, as opposed to general cleaning.
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Not talking and verifying your answers with each other like scientists
Answer: 439
Explanation: you just have to divide
