Dry cleaning

Dry cleaning is any cleaning process for clothing and textiles using a chemical solvent other than water. It is used to clean fabrics that degrade in water, and delicate fabrics that cannot withstand the rough and tumble of a washing machine and clothes dryer. It can eliminate labor-intensive hand washing.

Unlike what its name implies, dry cleaning is not actually a 'dry' process. Clothes are soaked in a different solvent other than water. The solvent used is typically toxic tetrachloroethylene (perchloroethylene), which the industry calls PCE. PCE is the most widely used solvent across the world, although new solvents have become more popular in the United States and Europe, including hydrocarbons, Green Earth, and Solvon K4 .

Modern dry cleaning use of non-water-based solvents to remove soil and stains from clothes was reported in 1855. The potential for using petroleum-based solvents such as gasoline and kerosene was recognized by French dye-works operator Jean Baptiste Jolly, who offered a new service that became known as nettoyage à sec—i.e., dry cleaning. Flammability concerns led William Joseph Stoddard, a dry cleaner from Atlanta, to develop Stoddard solvent (white spirit) as a slightly less flammable alternative to gasoline-based solvents. The use of highly flammable petroleum solvents caused many fires and explosions, resulting in government regulation of dry cleaners. After World War I, dry cleaners began using chlorinated solvents. These solvents were much less flammable than petroleum solvents and had improved cleaning power.

On March 3, 1821, Thomas L. Jennings became the first African-American to be granted a United States patent, for his cleaning process called "dry scouring," which was the precursor to dry cleaning.

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