Dry cleaning is a process of cleaning clothes and fabrics with solutions that do not contain water. The practice has traced back to France where around 1825 turpentine was used in the cleaning this process. As of 2002, the dry-cleaning industry estimates that approximately 36,000 dry cleaning establishments exist across the United States, with about 200,000 people employed in the industry.
Perc chemicals used in 85 per cent of the dry-cleaning shops as the primary solvent. It means that if perc is cancer-causing chemical, many people, including both workers in and people who live near dry cleaning facilities, may be adversely affected.