SAN FRANCISCO - JANUARY 29: Freshly pressed shirts are seen at Sohn's French Cleaners, which uses eco-friendly chemicals to dry clean clothes January 29, 2007 in San Francisco, California. The California Air Resources Board announced last week that it has enacted the nation's first statewide ban on the chemical perchloroethylene, a toxic solvent commonly used by dry cleaners. By 2023, dry cleaning machinery using perchloroethylene, also known as "perc", will be banned from use in the state of California. (Photo by Justin Sullivan/Getty Images)