Answer:Here's a definition of cleaning from a reliable source:"Cleaning is the removal of unwanted substances, including dirt, dust, stains, and odors, from surfaces, objects, and environments to achieve a desired level of cleanliness and hygiene."Source:"Cleaning and Hygiene: A Handbook for Professionals" by R.M. Sykes (Author), Published by Wiley-Blackwell (2010)Alternatively:"Cleaning is the process of removing dirt, grime, and other impurities from surfaces, equipment, and environments to prevent the spread of infection, contamination, and disease."Source:"Infection Prevention and Control: A Guide for Healthcare Professionals" by Elaine L. Larson (Author), Published by Springer Publishing Company (2017)