Cleaning

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Several cleaning methods

Hand washing (part of hygiene)

A dry cleaning machine

Ultrasonic parts cleaning

Carbon dioxide snow cleaning in an aerospace setting

Cleaning is the process of removing unwanted substances, such as dirt, infectious agents, and other impurities, from an object or environment. Cleaning is often performed for aesthetic, hygienic, functional, safety, or environmental protection purposes. Cleaning occurs in many different contexts, and uses many different methods. Several occupations are devoted to cleaning.