How do you clean the lens?

Those chemically treated eyeglass cleaners could scratch your camera lens. Use cleaners intended for photographic lenses, not alcohol or eyeglass solutions. First, blow away any loose dirt or dust with a bulb brush (not the same one used to clean the camera body) or a can of compressed air. Then, use a lens tissue intended for photographic equipment and either breath lightly onto your lens to form a mist, or moisten the tissue with a photographic lens cleaner. (Never wipe a dry lens.)