To help maintain your new Skeleton Optics sunglasses please use the micro-fiber bag included with your purchase. This case/cleaning cloth is designed to provide a lint free solution for cleaning and storage. Using this multi-purpose cloth will help extend the life of your lenses. In addition to daily cleaning you can periodically clean the eye wear under warm tap water to remove oils produced by your skin. DO NOT USE glass cleaners or other detergents to clean your lenses as they often leave a residue behind.