Have you ever walked into a dry cleaner and been bothered by the smell? Your nose knows: that unpleasant aroma could actually be toxic. For the last fifty years, dry cleaners have used perchloroethylene (perc) as their most common cleaning product. Perc is a probable human carcinogen that can cause nervous system, liver, and kidney damage. Dry cleaning workers are at most risk, but when we take dry cleaned clothes home, we expose our families to this toxic chemical as…