Chemicals used in the dry cleaning process typically include perchloroethylene, also called "perc," which both the Environmental Protection Agency and the National Academy of Sciences consider a "likely carcinogen." Other organizations, including the CDC, also have determined it to be likely to cause cancer. This chemical is the most widely used chemical for dry cleaning, used by 85-90% of dry cleaning operations.
Let me repeat - dry cleaning chemicals are linked to cancer. So, how on earth is a dry cleaner helping to "clean up cancer"?