Trichloroethylene, tetrachloroethylene (also known as perchloroethylene), and methylene chloride (also known as dichloromethane), are the main solvents in this group. Due to their non-flammability, these compounds have been widely used for cleaning metals in the electronics industry and for dry cleaning of clothes. The use of 1,1,1-trichloroethane was phased out at the end of 1995 under the Montreal Protocol.