Reference: Cleaning and Disinfecting Your Facility and Cleaning and Disinfection for Community Facilities on the CDC website.
Cleaning: refers to the removal of dirt and impurities, from surfaces. Cleaning alone does not kill germs, but it decreases their number and therefore the risk of spreading infection.
Disinfecting: works by using chemicals to kill germs on surfaces. This process does not necessarily clean dirty surfaces or remove germs.