DeoxIT Shield S-Series provides long-lasting protection on metal surfaces in severe environments. It is NOT a cleaner, protects, lubricates and maintains optimum conductivity on all metal connectors and contacts. Note: DeoxIT Shield has 0.0% cleaning action. Use on clean surfaces only.Recommended pre-cleaning with DeoxIT D-Series contact cleaner or other cleaning method for best protection. Use on NEW metal surfaces, usually in the manufacturing process. It is also ideal where high degrees of pollution (sulfur, salts, acids, etc.) are present.