WD-40® Multi-Use Product is not a contact cleaner and will leave a protective lubricating layer on the application surface. In some cases this is desired and WD-40 Company would recommend treating metal contacts with WD-40® Multi-Use Product after they have been cleaned. WD-40® Multi-Use Product can also be used to displace any moisture on electrical contacts and PCB’s. Why not try our WD-40 Specialist Contact Cleaner which is designed to clean metal electrical contacts.