Cleaning is the process of removing unwanted substances, such as dirt, infectious agents, and other impurities, from an object or environment. Cleaning occurs in many different contexts, and uses many different methods. Several occupations are devoted to cleaning. {visible soil}

Cleaners interact with soils on a Physical basis –Changes the solubility characteristics
Cleaners interact with soils on a Chemical basis –Reacts with the soil, forms a new, water soluble substance.