Laundry is hung to dry above an Italian street.Laundry is the act of washing clothing and linens.

Before industrialization

thumb|Laundry in the river in contemporary Abidjan, Ivory Coast. thumb|Irreler Bauerntradition shows the history of laundry in the Roscheider Hof, Open Air Museum Laundry was first done in watercourses Fact: date=June 2008, letting the water carry away the materials which could cause stains and smells. Laundry may still be done this way in some less industrialized areas and rural regions. Agitation helps remove the dirt, so the laundry is often rubbed, twisted, or slapped against flat rocks. Wooden bats or clubs could be used to help with beating the dirt out. These were often called washing beetles or bats and could be used by the waterside on a rock (a beetling-stone), on a block (battling-block), or on a board. They were once common across Europe and were also used by settlers in North America.

Various chemicals may be used to increase the solvent power of water, such as the compounds in soaproot or yucca-root used by Native American tribes. Soap, a compound made from lye (from wood-ash) and fat, is an ancient and very common laundry aid. However, modern washing machines typically use powdered or liquid laundry detergent in place of more traditional soap.

When no watercourses were available, laundry was done in water-tight vats or vessels. Sometimes large metal cauldrons were filled with fresh water and heated over a fire; boiling water was even more effective than cold in removing dirt. The washboard, a corrugated slab of a hard material such as metal, replaced rocks as a surface for loosening soil.

Once clean, the clothes were wrung out — twisted to remove most of the water. Then they were hung up on poles or clotheslines to air dry, or sometimes just spread out on clean grass.

The Industrial Revolution

The Industrial Revolution completely transformed laundry technology.

The mangle (wringer US) was developed in the 18th century — two long rollers in a frame and a crank to revolve them. A laundry-worker took sopping wet clothing and cranked it through the mangle, compressing the cloth and expelling the excess water. The mangle was much quicker than hand twisting. It was a variation on the box mangle used primarily for pressing and smoothing cloth.

Meanwhile 18th century inventors further mechanized the laundry process with various hand-operated washing machines. Most involved turning a handle to move paddles inside a tub. Then some early 20th century machines used an electrically powered agitator to replace tedious hand rubbing against a washboard. Many of these were simply a tub on legs, with a hand-operated mangle on top. Later the mangle too was electrically powered, then replaced by a perforated double tub, which spun out the excess water in a spin cycle.