The Purosol PUOC-10070 Optical Lens Cleaning Combo Kit contains lens cleaning solution designed to be environmentally friendly. The enzyme-based Purosol cleans at the molecular level, neutralizing the bonds that dust, dirt, oil, and grime use to adhere to glass or plastic lens surfaces. Unlike many other cleaning solvents, Purosol is completely safe, and will not harm your lenses. This unique solution lasts longer than other solvents, and is designed specifically for the demands of high-end, multi-coated lenses. Purosol Optical was originally developed for NASA and the US military for use on high-end multi-coated optics. Combining the power of organic plant extracts and state-of-the-art green chemistry, it is the world s most advanced cleaning solution.