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Tetrachloroethylene, also known under the systematic name tetrachloroethene, or perchloroethylene , and many other names, is a chlorocarbon with the formula Cl2C=CCl2. It is a colorless liquid widely used for dry cleaning of fabrics, hence it is sometimes called "dry-cleaning fluid." It has a sweet odor detectable by most people at a concentration of 1 part per million . Worldwide production was about 1 million metric tons in 1985.