In about 85% of dry-cleaning shops, perchloroethylene (or “perc”) is used, a chemical that the Environmental Protection Agency (EPA) considers both a health and environmental hazard. So before you drop off that stack of shirts that will probably survive your delicate cycle anyway, learn more about the environmental impact of dry cleaning and about green dry cleaners: http://www.ucsusa.org/publications/greentips/do-green-dry-cleaners-exist...