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In page Trichloroethylene:

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Trichloroethylene has been used as a dry cleaning solvent, although mostly replaced by tetrachloroethylene, except for spot cleaning – for grease and oil stains – where it is still often used under various tradenames.[citation needed] It was found unfavourable for dry cleaning because it tended to dissolve acetate dyes, which tetrachloroethylene did not. Trichloroethylene is used to remove grease and lanolin from wool before weaving.[1]