BOSTON Contact Cleaner is a plastic safe, technically proven, stable high purity cleaning solvent. Boston Contact cleaner is non-corrosive, non-staining, rapid evaporation and contains no lubricant. Boston Contact Cleaner is recommended for cleaning relays, switches, circuit breakers, alarm and signal systems, printed circuit boards, connectors, generators, lab and test equipment, video heads/drums, terminals, plugs and jacks. Please Note: Never spray contents at yourself or any other person. Intentional misuse by deliberately inhaling contents is very harmful & likely to cause serious injury or death. Never attempt to pierce or incinerate can. When can is empty you will notice white propellant gas being expelled, at this time use should be discontinued and can disposed of safely or recycled.