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Perchloroethylene (or "PERC") is the most common form of dry cleaning, used by 80 per cent of the industry in Canada. Typewriter correction fluid and shoe polish are among the consumer products that contain PERC. PERC has been designated under the Canadian Environmental Protection Act as a persistent, bio-accumulative chemical that is toxic to the environment. Short term exposure to PERC can cause adverse health effects on the nervous system. Contact with PERC in its liquid or vapour form can irritate the skin, eyes, nose and throat. Long term exposure to PERC can cause liver and kidney damage. PERC has been shown to cause cancer in laboratory animals that repeatedly breathed PERC in air.