Headlight polish is a specialized abrasive compound designed to remove the cloudy, yellow oxidation that forms on plastic (polycarbonate) headlight lenses due to UV exposure. Unlike standard glass cleaners, this polish physically sands down the microscopic layer of damaged plastic to reveal fresh, clear material underneath. It is often part of a kit that includes sanding pads and a UV sealant. Restoring headlights improves night visibility significantly and enhances the overall cosmetic appearance of older vehicles.