Nano Shield is the ultimate 3 in 1 cleaner, protector, and water repellant. Simply by spraying and wiping, a nano ceramic film bonds to the surface not just cleaning a surface, but also protecting it from futre messes and repelling water. Nano Shiled is safe for glass, plastic, screens, polarized, prescription, and transition. Commonly used on Navigation screens, Sunglasses, Forward facing sonar, Phone screens, and much more!