For over 15 years Cat Crap has been rated #1 for lens cleaning & fog prevention. It is suitable for use on all types of visors, sunglasses, binoculars and other optical lenses (inside & out) as it is a mild cleaner and is safe for use on all types of lenses and coatings. Cat Crap comes in a handy snap close container that will easily fit in your bag or with any gear you might carry along with you.