[Chemical name] tetrachloroethylene [Chemical formula] C2Cl4 [Common or alternative name] tetrachloroethene [Source and description] 
The most common solvent for dry cleaning, it is available in aerosol form from hardware, auto supply, and home improvement stores. Brands like "Lectra Motive Auto Care" and "Gummout Professional Brake Parts Cleaner" contain as much as 99% with methylene chloride as the only major contaminant.