ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

How Does Detergent Work?

Updated on April 27, 2024

Detergent is a material that increases the cleaning effect of water on soiled objects.

There are also nonaqueous detergents that enhance the cleaning power of organic solvents; for example, they are used in dry cleaning and in engine oils to prevent dirt and gummy decomposition products from depositing on the metal. However, this article will discuss only those detergents that are effective in water.


Detergents vary in composition, depending on the cleaning task for which they are intended. Those that are used for laundering usually contain several basic kinds of ingredients. There are surface active agents, or surfactants, which are substances that greatly lower the surface tension of water. This physical effect is important in detergency, and many surfactants are effective detergents by themselves. There are also builders, which are generally inorganic salts or alkalis that enhance the cleaning action of the surfactant, although they themselves may not be good detergents. Detergents may also contain auxiliary components that impart special performance characteristics to the material.

Soap, which is made from fats or fatty acids, is a detergent. However, in common usage the term "detergent" is not applied to soap but only to the synthetic non-soap substances first introduced in the 1930s.


Surfactants have elongated molecules, one end of which is a water-insoluble non-polar hydrocarbon, while the other end is a water-soluble polar radical, which may or may not be capable of ionizing. Thus there are anionic (negatively charged), cationic (positively charged), and nonionic surfactants. The anionic and nonionic types are commonly used as detergent components.

Soap is an anionic surfactant in which the polar group is a carboxyl group. Both the free-acid form of soap and its salts with heavy metals are insoluble. Therefore, soap does not perform well in hard or acid water. The synthetic anionic surfactants that have either sulfonate or sulfate polar groups form soluble heavy metal salts and acids. Their ability to perform well in hard water and at low pH is a major advantage.

Most nonionic surfactants are liquids. They tend to be poor foamers and are favored where low foam is desirable. The nonionic surfactants perform well over a wide range of water hardness and pH.


The most effective builders for synthetic laundering formulations are the condensed phosphates, particularly sodium tripolyphosphate, which is a deflocculant and water softener that contributes greatly to the overall detergent effect. In many detergents, builders serve special functions other than cleaning. For example, silicates boost the cleaning power of soap but contribute little to that of the synthetic surfactants; however, they are used in synthetic formulations to inhibit the corrosion of metal washing-machine parts.

Auxiliary Agents

Among the auxiliary agents used in detergents the most important are the foam stabilizers, the optical brighteners or whiteners, and the antiredeposition agents. Foam stabilizers are organic materials that are closely related to surfactants. Optical brighteners are colorless dyes that are deposited more or less irreversibly on the fabric during washing; they fluoresce in sunlight, thereby producing a brighter than normal appearance. During washing, some components of the removed dirt tend to redeposit on the fabric. An antiredeposition agent strongly inhibits this effect and is an essential ingredient in synthetic laundering formulations.

Types of Detergents

The major categories of detergents are those for personal use, laundering, hard-surface cleaning, and specialized industrial cleaning.

Detergents for personal use seldom contain builders. Soap bars consist essentially of pure soap, aside from coloring and perfume and normal moisture. Synthetic surfactant bars contain binding materials as well as active surfactant. The binders give the bar the desired mechanical properties. Shampoos are usually solutions of synthetic surfactants together with foam-boosting ingredients. They often contain special auxiliaries for controlling dandruff or conditioning hair.

The largest single use of detergents is in laundering. Laundering detergents are most commonly found in the form of spray-dried beads. Such detergents contain 15% to 25% synthetic surfactant, 30% to 40% condensed phosphate, 5% anticorrosive silicate, and 1% or less of antiredeposition agent and optical brightener. The remainder, except for other special auxiliaries, consists of inert inorganic salt, which gives the dried product good physical and mechanical properties. Liquid laundering detergents contain essentially the same active ingredients as the bead type, but in place of the inert salt they have solubilizers and water. Cold-water detergents contain surfactant auxiliaries that soften and loosen the dirt rapidly at low temperatures.

Detergents for hard-surface cleaning contain less organic surfactant and more builder than laundering detergents. The builders vary according to the alkalinity desired and the type of cleaning to be done. Condensed phosphates and ortho-phosphate are effective, versatile hard-surface cleaners and are used in many different formulations. Sodium silicates are used in machine dishwashing compounds. Scouring powders contain a large proportion of abrasive together with builders, such as ammonia and borax. Window cleaners and fast-acting, liquid general-purpose cleaners may also contain organic solvents.

Most industrial cleaning involves hard-surface substrates. The operations include the cleaning of metal parts during fabrication and before plating or painting; maintenance cleaning of ve-icles; and janitorial cleaning. The detergents used are usually high in builder content and contain low-foaming surfactants of high cleaning power. Foam is objectionable because it lowers the efficiency of most cleaning machines.

Detergents and Water Pollution

Early synthetic detergents caused water pollution because their surfactant components were not susceptible to breakdown by bacteria in the soil and in sewage treatment plants. The detergent foam persisted in streams and impeded the operation of sewage disposal plants. This situation has been almost entirely corrected by the adoption of biodegradable surfactants, which are attacked and broken down readily by sewage and soil bacteria. However, there is still concern over the possible damaging effects of the phosphate component of detergents when it is discharged into streams and lakes. Phosphate can stimulate the growth of algae and upset the ecological balance of large bodies of water.

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

© 2010 Bits-n-Pieces


This website uses cookies

As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at:

Show Details
HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
LoginThis is necessary to sign in to the HubPages Service.
Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
AkismetThis is used to detect comment spam. (Privacy Policy)
HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
MavenThis supports the Maven widget and search functionality. (Privacy Policy)
Google AdSenseThis is an ad network. (Privacy Policy)
Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
Index ExchangeThis is an ad network. (Privacy Policy)
SovrnThis is an ad network. (Privacy Policy)
Facebook AdsThis is an ad network. (Privacy Policy)
Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
AppNexusThis is an ad network. (Privacy Policy)
OpenxThis is an ad network. (Privacy Policy)
Rubicon ProjectThis is an ad network. (Privacy Policy)
TripleLiftThis is an ad network. (Privacy Policy)
Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
ClickscoThis is a data management platform studying reader behavior (Privacy Policy)