R-11 contact cleaner 200ml for disolving and remouving oxidantion fromany electrical contacts, switches, push buttons, commutators, plugs, sockets. keyboards, etc. Thanks to a special chemical aditive, prevents a new oxidation process in the treated parts. Eliminates the creaking of potentiometers. It assures a deep and effective cleaning in linear and sliding contacts, without any risk for the support plastic materials. Ozone safe (ecological product).