The solvent-free Optical Cleaning Spray from Sensei is formulated to clean glass lenses and leave them streak- and smudge-free without damaging lens coatings. The environmentally-friendly formulation gently cleans all kinds of glass optics and removes dust, smudges, and fingerprints, without harming the glass. The enzyme-based formula is alcohol- and ammonia-free and works by dissolving the molecular bond between lens surfaces and the dust, oil, and grime that cling to them. It removes stubborn smudges and fingerprints and cleans optics such as lenses, telescopes, or eyeglasses without leaving streaks. Sensei's Optic Cleaning Spray is nontoxic and does not contain chemicals that may harm the environment.