DeoxIT D-Series contact cleaner is a fast-acting deoxidizing solution that cleans, protects, lubricates, and improves conductivity on all metal connectors and contacts. Use as a general treatment for connectors, contacts, and other metal surfaces, and on non-critical metal surfaces with severe oxidation and corrosion. If the metal surface is discolored, it is severe. DeoxIT® dissolves the contamination and protects the surface. For reference, DeoxIT® has approximately 20% cleaning action.