This two-ounce bottle of RayVu Optical Cleaner comes in an easy-to-use spray bottle and can be used to clean filters, lenses, and screens. The cleaner becomes a crystal-clear coating on the glass surface, and is nontoxic, nonflammable, and fog resistant. Once the coating dries, the glass becomes resistant to dust and fingerprints. Singh-Ray recommends spraying the liquid onto the included microfiber cleaning cloth directly, to get the best results after cleaning.