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.