11oz. 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.