WD-40: WD-40 Specialist® Contact Cleaner, featuring patented Smart Straw technology, blasts away oil, dirt, flux reside and condensation from sensitive electronics and electrical equipment with pinpoint precision. It dries quickly, leave no residue and removes over 95% of common surface contaminants, making it the best at cleaning electrical contacts and for optimal performance of equipment. Safe and ideal for use on printed circuit boards, controls, battery terminals, switches, precision instruments and electric panels.Safe to use on electrical equipment, most plastics*, rubber and metalCleans sensitive electronics equipment and removes over 95% of common surface contaminants for optimal performance**Leaves no residue360° valve, use can upright or upside downStraw down for a wide sprayStraw engaged for a precision sprayUse on accessories or equipment that have circuitry contamination such as moisture, flux or dirtSafe on circuits, leaves no harmful residue400ml