Now and then a customer ask what someone should use to clean a
binocular. You can, of course, go with fancy
chemicals and lens tissues, but I have had my best luck with a simple
lens pen. These go under many brand names, but the one I currently have is the Nikon version. They last a long time and the little squeegee tip is perfect for cleaning around the edges of the lenses. Next best is a
lens cloth. These are a better option for large lenses, especially for eyeglasses. I carry one all the time.