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Windshield washer fluid (also called windshield wiper fluid, wiper fluid, screen wash (in the UK), or washer fluid) is a
fluid In physics, a fluid is a liquid, gas, or other material that continuously deforms (''flows'') under an applied shear stress, or external force. They have zero shear modulus, or, in simpler terms, are substances which cannot resist any shear ...
for motor vehicles that is used in cleaning the
windshield The windshield (North American English) or windscreen (Commonwealth English) of an aircraft, car, bus, motorbike, truck, train, boat or streetcar is the front window, which provides visibility while protecting occupants from the elements. Mo ...
with the
windshield wiper A windscreen wiper, windshield wiper, wiper blade (American English), or simply wiper, is a device used to remove rain, snow, ice, washer fluid, water, or debris from a vehicle's front window. Almost all motor vehicles, including cars, truck ...
while the vehicle is being driven.


Delivery system

A control within the car can be operated to spray washer fluid onto the windshield, typically using an electrical pump via jets mounted either beneath the windshield or beneath the wiper blade(s). The windshield wipers are automatically turned on, cleaning dirt and debris off the windshield. Some vehicles use the same method to clean the rear window or the headlights. The first windshield cleaner unit offered for automobiles was in 1936, as an aftermarket option to be installed on cars after they were bought. In 1946 General Motors installed windshield washers on all their vehicles as an extra cost option, while Chrysler offered the feature optionally in 1950 and Ford offered them for 1952. Washer fluid may sometimes be preheated before being delivered onto the windshield. This is especially desirable in colder climates when a thin layer of ice or frost accumulates on the windshield's surface, as it eliminates the need to manually scrape the windshield or pour warm water on the glass. Although there are a few aftermarket preheat devices available, many automobile makers offer this feature factory installed on at least some of their vehicles. For example,
General Motors The General Motors Company (GM) is an American Multinational corporation, multinational Automotive industry, automotive manufacturing company headquartered in Detroit, Michigan, United States. It is the largest automaker in the United States and ...
had begun equipping vehicles with heated washer fluid systems from the factory beginning in 2006 with the
Buick Lucerne The Buick Lucerne is a full-size car manufactured by General Motors from 2005 to 2011. Named for the city of Lucerne, Switzerland, it served as Buick's top-of-the-line sedan until it was replaced by the second generation Buick LaCrosse. History T ...
sedan. The system emits a fine mist of heated water that clears frost without damaging the windshield itself. GM also claims heated washer fluid helps in removing bug splatters and other road accumulation. The company halted the production of these mechanisms after they found that it was prone to start engine fires. Mercedes Benz has used a thermostatically controlled heating element, with the engine coolant as the heat source, since the mid 1980s on certain models. Many other manufacturers have employed electrically heated washer nozzles primarily to prevent them from freezing closed, not in an attempt to heat the fluid itself.


Varieties

Windshield washer fluid is sold in many formulations, some are pre-mixed and others require dilution before use. The most common washer fluid solutions are given labels such as "All-Season", "Bug Remover", or "De-icer", and usually are a combination of solvents with a detergent. Dilution factors will vary depending on season, for example in winter, the dilution factor may be 1:1, whereas during summer the dilution factor may be 1:10. It is sometimes sold as sachet of crystals, which is also diluted with water.
Distilled Distillation, or classical distillation, is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation, usually inside an apparatus known as a still. Dry distillation is the heating ...
or
deionised water Purified water is water that has been mechanically filtered or processed to remove impurities and make it suitable for use. Distilled water was, formerly, the most common form of purified water, but, in recent years, water is more frequently puri ...
is the preferred diluent, since it will not leave trace mineral deposits on the glass.
Anti-freeze An antifreeze is an additive which lowers the freezing point of a water-based liquid. An antifreeze mixture is used to achieve freezing-point depression for cold environments. Common antifreezes also increase the boiling point of the liquid, all ...
, or methylated spirits, may be added to a mixture to give the product a lower freezing temperature.
Methanol Methanol (also called methyl alcohol and wood spirit, amongst other names) is an organic chemical and the simplest aliphatic alcohol, with the formula C H3 O H (a methyl group linked to a hydroxyl group, often abbreviated as MeOH). It is a ...
vapor is harmful when breathed in, and methanol poisoning presents a risk of death, severe ocular toxicity, and other severe effects if ingested. As of 9 May 2018, methanol was banned from use in windscreen washing and defrosting products in the European Union. Fluids are now usually based on ethanol, often with small quantities of
isopropanol Isopropyl alcohol (IUPAC name propan-2-ol and also called isopropanol or 2-propanol) is a colorless, flammable organic compound with a pungent alcoholic odor. As an isopropyl group linked to a hydroxyl group (chemical formula ) it is the simple ...
,
ethylene glycol Ethylene glycol (IUPAC name: ethane-1,2-diol) is an organic compound (a vicinal diol) with the formula . It is mainly used for two purposes, as a raw material in the manufacture of polyester fibers and for antifreeze formulations. It is an odo ...
, and
Butanone Butanone, also known as methyl ethyl ketone (MEK), is an organic compound with the formula CH3C(O)CH2CH3. This colourless liquid ketone has a sharp, sweet odor reminiscent of acetone. It is produced industrially on a large scale, but occurs in n ...
. Many cars display a warning when the fluid level is low, and some car makers have replaced the float sensor generating this signal with a simple two-pin probe in the tank. This requires a (slightly) conductive fluid, but most common windshield washer fluid mixtures will work. Mercedes-Benz sells a special fluid for their cars. Concerns have been raised about the overall environmental aspects of washer fluid, for example by the California Air Resources Board. Widespread use of wiper fluid (amounting to billions of liters each year) can lead to cumulative
air pollution Air pollution is the contamination of air due to the presence of substances in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. There are many different types ...
and
water pollution Water pollution (or aquatic pollution) is the contamination of water bodies, usually as a result of human activities, so that it negatively affects its uses. Water bodies include lakes, rivers, oceans, aquifers, reservoirs and groundwater. Water ...
. The California Air Resources Board (CARB) in particular has brought strong regulatory pressure on suppliers of windshield washer fluid, including measures to limit or ban the sale of "concentrated" fluids, out of concern that users will not sufficiently dilute the mixtures. ''Mercury News'' later wrote an article about the board's action, entitled "Roadshow: California's ban on low-temp windshield washer fluid".
Consumer advocacy groups Consumer organizations are advocacy groups that seek to protect people from corporate abuse like unsafe products, predatory lending, false advertising, astroturfing and pollution. Consumer Organizations may operate via protests, litigation, cam ...
and auto enthusiasts believe that the alcohols and solvents present in some, but not all, windshield washer fluid can damage the vehicle. These critics point to the corrosive effects of
ethanol Ethanol (abbr. EtOH; also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound. It is an Alcohol (chemistry), alcohol with the chemical formula . Its formula can be also written as or (an ethyl ...
, methanol, and other components on paint, rubber, car wax, and plastics, and groups propose various alternatives and homemade recipes to protect the finish and mechanics of the motor vehicle.


Legionnaires' disease

On 14 June 2010, the UK's Health Protection Agency announced the results of a preliminary study of 75 patients, which found an association between the use of windshield washer fluid and
Legionnaires' disease Legionnaires' disease is a form of atypical pneumonia caused by any species of ''Legionella'' bacteria, quite often '' Legionella pneumophila''. Signs and symptoms include cough, shortness of breath, high fever, muscle pains, and headaches. Naus ...
, which is spread by breathing in aerosolized bacteria. It had been noticed that prevalence of the disease was five times higher among professional drivers. *


See also

*
Antifreeze An antifreeze is an additive which lowers the freezing point of a water-based liquid. An antifreeze mixture is used to achieve freezing-point depression for cold environments. Common antifreezes also increase the boiling point of the liquid, all ...


References


Further reading

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External links

* {{DEFAULTSORT:Windshield Washer Fluid Auto parts Automotive chemicals Windscreen wiper