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 Aesthetics, or esthetics, is a branch of philosophy that deals with the nature of beauty and taste, as well as the philosophy of art (its own area of philosophy that comes out of aesthetics). It examines aesthetic values, often expressed th ...

hygienic Hygiene is a series of practices performed to preserve health. According to the World Health Organization (WHO), "Hygiene refers to conditions and practices that help to maintain health and prevent the spread of diseases." Personal hygiene refer ...

functional Functional may refer to: * Movements in architecture: ** Functionalism (architecture) ** Form follows function * Functional group, combination of atoms within molecules * Medical conditions without currently visible organic basis: ** Functional sy ...

environmental A biophysical environment is a biotic and abiotic surrounding of an organism or population, and consequently includes the factors that have an influence in their survival, development, and evolution. A biophysical environment can vary in scale f ...

, or safety purposes. Cleaning occurs in many different contexts, and uses many different methods. Several occupations are devoted to cleaning.

Contexts

Cleaning occurs in various commercial, domestic, personal, and environmental contexts, which differ in scale and requirements. *

Commercial cleaning Commercial cleaning companies are contracted to carry out cleaning jobs in a variety of premises. Cleaning techniques and equipment Commercial office cleaning companies use a wide variety of cleaning methods, chemicals, and equipment to facil ...

, in business or other commercial settings **

Terminal cleaning Terminal cleaning is the thorough cleaning of a room after use, used in healthcare environments to control the spread of infections. Justification Nosocomial infections claim approximately 90,000 lives in the United States annually. When patie ...

, in healthcare settings *

Environmental remediation Environmental remediation deals with the removal of pollution or contaminants from environmental media such as soil, groundwater, sediment, or surface water. Remedial action is generally subject to an array of regulatory requirements, and may al ...

, the removal of pollution or contaminants from the natural environment *

Housekeeping Housekeeping is the management and routine support activities of running an organised physical institution occupied or used by people, like a house, ship, hospital or factory, such as tidying, cleaning, cooking, routine maintenance, shopping, ...

, including

spring cleaning Spring cleaning is the practice of thoroughly cleaning a house in the springtime. The practice of spring cleaning is especially prevalent in climates with a cold winter. In many cultures, annual cleaning occurs at the end of the year, which may b ...

Hygiene Hygiene is a series of practices performed to preserve health. According to the World Health Organization (WHO), "Hygiene refers to conditions and practices that help to maintain health and prevent the spread of diseases." Personal hygiene refer ...

, including

personal grooming Grooming (also called preening) is the art and practice of cleaning and maintaining parts of the body. It is a species-typical behavior. In animals Individual animals regularly clean themselves and put their fur, feathers or other skin cove ...

Methods

Cleaning is broadly achieved through mechanical action and/or

solvent A solvent (s) (from the Latin '' solvō'', "loosen, untie, solve") is a substance that dissolves a solute, resulting in a solution. A solvent is usually a liquid but can also be a solid, a gas, or a supercritical fluid. Water is a solvent for ...

action; many methods rely on both processes. *

Washing Washing is a method of cleaning, usually with water and soap or detergent. Washing and then rinsing both body and clothing is an essential part of good hygiene and health. Often people use soaps and detergents to assist in the emulsification of ...

, usually done with water and often some kind of

soap Soap is a salt of a fatty acid used in a variety of cleansing and lubricating products. In a domestic setting, soaps are surfactants usually used for washing, bathing, and other types of housekeeping. In industrial settings, soaps are use ...

detergent A detergent is a surfactant or a mixture of surfactants with cleansing properties when in dilute solutions. There are a large variety of detergents, a common family being the alkylbenzene sulfonates, which are soap-like compounds that are more ...

Pressure washing Pressure washing or power washing is the use of high-pressure water spray to remove loose paint, mold, grime, dust, mud, and dirt from surfaces and objects such as buildings, vehicles and concrete surfaces. The volume of a mechanical pressure w ...

, using a high-pressure stream of water **

Wet cleaning Wet cleaning refers to methods of professional cleaning that, in contrast to traditional dry cleaning, avoids the use of chemical solvents, the most common of which is tetrachloroethylene (commonly called perchloroethylene or "perc"). Environment ...

, methods of professional laundering that avoid the use of chemical solvents *

Abrasive blasting Sandblasting, sometimes known as abrasive blasting, is the operation of forcibly propelling a stream of abrasive material against a surface under high pressure to smooth a rough surface, roughen a smooth surface, shape a surface or remove su ...

, typically used to remove bulk material from a surface, may be used to remove contaminants as well *

Acoustic cleaning Acoustic cleaning is a maintenance method used in material-handling and storage systems that handle bulk granular or particulate materials, such as grain elevators, to remove the buildup of material on surfaces. Acoustic cleaning apparatus, u ...

, the use of

sound wave In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the ''reception'' of such waves and their ''perception'' by the ...

s to shake particulates loose from surfaces **

Ultrasonic cleaning Ultrasonic cleaning is a process that uses ultrasound (usually from 20 to 40 kHz) to agitate a fluid, with a cleaning effect. Ultrasonic cleaners come in a variety of sizes, from small desktop units with an internal volume of less than , to large ...

, using ultrasound, usually from 20–400 kHz **

Megasonic cleaning Megasonic cleaning is a type of acoustic cleaning, related to ultrasonic cleaning. It is a gentler cleaning mechanism, less likely to cause damage, and is used in wafer, medical implant, and industrial part cleaning. Similar to ultrasonic cleaning ...

, a gentler mechanism than ultrasonic cleaning, used in

wafer A wafer is a crisp, often sweet, very thin, flat, light and dry biscuit, often used to decorate ice cream, and also used as a garnish on some sweet dishes. Wafers can also be made into cookies with cream flavoring sandwiched between them. They ...

, medical implant, and industrial part cleaning *

Carbon dioxide cleaning Carbon dioxide cleaning (CO2 cleaning) comprises a family of methods for parts cleaning and sterilization, using carbon dioxide in its various phases. Due to being non-destructive, non-abrasive, and residue-free, it is often preferred for use on ...

, a family of methods for parts cleaning and sterilization using

carbon dioxide Carbon dioxide (chemical formula ) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature. In the air, carbon dioxide is transpar ...

in its various phases *

Dry cleaning Dry cleaning is any cleaning process for clothing and textiles using a solvent other than water. Dry cleaning still involves liquid, but clothes are instead soaked in a water-free liquid solvent. Tetrachloroethylene (perchloroethylene), known in ...

of clothing and textiles, using a chemical solvent other than water *

Flame cleaning Flame cleaning, also known as flame gouging, is the process of cleaning a structural steel surface by passing an intensely hot oxyacetylene flame over it. Mill scale and rust are removed by the reducing effect of the flame and the action of the heat ...

of structural steel, with an

oxyacetylene Principle of burn cutting Oxy-fuel welding (commonly called oxyacetylene welding, oxy welding, or gas welding in the United States) and oxy-fuel cutting are processes that use fuel gases (or liquid fuels such as gasoline or petrol, diesel, ...

flame *

Green cleaning Green cleaning refers to using cleaning methods and products with environmentally friendly ingredients and procedures which are designed to preserve human health and environmental quality. Green cleaning techniques and products avoid the use of pro ...

, using environmentally friendly methods and products *

Plasma cleaning Plasma cleaning is the removal of impurities and contaminants from surfaces through the use of an energetic plasma or dielectric barrier discharge (DBD) plasma created from gaseous species. Gases such as argon and oxygen, as well as mixtures such ...

, using energetic

plasma Plasma or plasm may refer to: Science * Plasma (physics), one of the four fundamental states of matter * Plasma (mineral), a green translucent silica mineral * Quark–gluon plasma, a state of matter in quantum chromodynamics Biology * Blood pla ...

or dielectric barrier discharge plasma created from various gases *

Sputter cleaning In physics, sputtering is a phenomenon in which microscopic particles of a solid material are ejected from its surface, after the material is itself bombarded by energetic particles of a plasma or gas. It occurs naturally in outer space, and can ...

, performed in a vacuum by using physical

sputtering In physics, sputtering is a phenomenon in which microscopic particles of a solid material are ejected from its surface, after the material is itself bombarded by energetic particles of a plasma or gas. It occurs naturally in outer space, and can ...

of the surface *

Steam cleaning Steam cleaning involves using steam for cleaning. Its uses include domestic applications in cleaning flooring and household dirt removal, and industrial uses in removing grease and dirt from engines. Use Steam cleaning is not suited for all ma ...

, in both domestic and industrial contexts *

Thermal cleaning Thermal cleaning is a combined process involving pyrolysis and Redox, oxidation. As an industrial application, thermal cleaning is used to remove Organic chemistry, organic substances such as polymers, plastics and coatings from parts, products or ...

, in industrial settings, involving

pyrolysis The pyrolysis (or devolatilization) process is the thermal decomposition of materials at elevated temperatures, often in an inert atmosphere. It involves a change of chemical composition. The word is coined from the Greek-derived elements ''py ...

and

oxidation Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a d ...

Ultraviolet germicidal irradiation Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (ultraviolet C or UV-C) light to kill or inactivate microorganisms by destroying nucleic acids and disrupting their DNA, leaving them unabl ...

, which destroys

microorganism A microorganism, or microbe,, ''mikros'', "small") and ''organism'' from the el, ὀργανισμός, ''organismós'', "organism"). It is usually written as a single word but is sometimes hyphenated (''micro-organism''), especially in olde ...

s; used extensively in the medical and food industries

Cleaning by item

Some items and materials require specialized cleaning techniques, due to their shape, size, location, or the material properties of the object and contaminants.

Buildings and infrastructure

* Beach cleaning *

Carpet cleaning Carpet cleaning is performed to remove stains, dirt, and allergens from carpets. Common methods include hot water extraction, dry-cleaning, and vacuuming. Hot water extraction Hot water extraction, sometimes mistakenly called "steam cleaning ...

* Chimney cleaning *

Crime scene cleanup Crime scene cleanup is a term applied to cleanup of blood, bodily fluids, and other potentially infectious materials (OPIM). It is also referred to as biohazard remediation, and forensic cleanup, because crime scenes are only a portion of the si ...

Exterior cleaning Exterior cleaning is the process of cleaning a building's exterior part including the restoration of hygiene or removal of litter and/or dirt on the outside of the building. It is not to be confused with interior cleaning, or the act of cleaning ...

Floor cleaning Floor cleaning is a major occupation throughout the world. The main job of most cleaners is to clean floors. Reasons for cleaning floors The principal reasons for floor cleaning are: * To prevent injuries due to tripping or slipping. Injuri ...

Graffiti removal Graffiti Graffiti (plural; singular ''graffiti'' or ''graffito'', the latter rarely used except in archeology) is art that is written, painted or drawn on a wall or other surface, usually without permission and within public view. Graffiti ra ...

Roof cleaning Roof cleaning is the process of removing algae, mold, mildew, lichen and moss from roofs. Also cleaning oxidation on metal roofs. Cleaning can extend the duration of a roof's ability to function. Algae and other types of build-up often form on t ...

Silo cleaning {{unreferenced, date=December 2007 Silo cleaning is a process to maximize the efficiency of storage silos that hold bulk powders or granules. In silos, material is fed through the top and removed from the bottom. Typical silo applications include ...

* Street cleaning

Other items

* Coin cleaning *

Conservation and restoration of cultural property The conservation and restoration of cultural property focuses on protection and care of cultural property, cultural property (tangible cultural heritage), including Collection (artwork), artworks, Architectural conservation, architecture, Archae ...

, which often involves careful cleaning *

Jewellery cleaning Jewelry cleaning is the practice of removing dirt or tarnish from jewelry Jewellery ( UK) or jewelry ( U.S.) consists of decorative items worn for personal adornment, such as brooches, rings, necklaces, earrings, pendants, bracelets, and ...

Laundry Laundry refers to the washing of clothing and other textiles, and, more broadly, their drying and ironing as well. Laundry has been part of history since humans began to wear clothes, so the methods by which different cultures have dealt with t ...

, the washing of clothes and other textiles *

Parts cleaning Parts cleaning is essential to many industrial processes, as a prelude to surface finishing or to protect sensitive components. Electroplating is particularly a sensitive to part cleanliness, since molecular layers of oil can prevent the adhesion ...

, in industry *

Pot washing Pot washing is the process of cleaning low to heavily baked-on items off of restaurant kitchen food equipment, including pots, pans, trays, tubs and more. Pot washing is often a heavy sector in restaurants and kitchens, ergonomically a burden and ...

, in food service *

Teeth cleaning Teeth cleaning is part of oral hygiene and involves the removal of dental plaque from teeth with the intention of preventing cavities (dental caries), gingivitis, and periodontal disease. People routinely clean their own teeth by brushing and inter ...

Tube cleaning Tube cleaning describes the activity of, or device for, the cleaning and maintenance Maintenance may refer to: Biological science * Maintenance of an organism * Maintenance respiration Non-technical maintenance * Alimony, also called ...

Occupations involving cleaning

Several occupations involve cleaning, either in their entirety or among other duties. *

Cleaner A cleaner or a cleaning operative is a type of industrial or domestic worker who cleans homes or commercial premises for payment. Cleaning operatives may specialise in cleaning particular things or places, such as window cleaners. Cleaning oper ...

Housekeeper (domestic worker) A housekeeper (also called necessary woman) is an individual responsible for the supervision of a house's cleaning staff. The housekeeper may also perform the cleaning duties themself. History In the great houses of the eighteenth, nineteenth a ...

Janitor A janitor (American English, Scottish English), also known as a custodian, porter, cleanser, cleaner or caretaker, is a person who cleans and maintains buildings. In some cases, they will also carry out maintenance and security duties. A simil ...

Maid A maid, or housemaid or maidservant, is a female domestic worker. In the Victorian era domestic service was the second largest category of employment in England and Wales, after agricultural work. In developed Western nations, full-time maids ...

Contexts

Methods

Cleaning by item

Buildings and infrastructure

Other items

Occupations involving cleaning

See also

General

Biology and health

Organizing

Technologies

Other contexts