Another one. Wal-Mart sells a blue box, about 1″ thick, maybe 6″x3″ in size, inside are foil-sealed packages of a sheet of material suitable for cleaning high-quality eyeglasses, wetted with a alcohol-based cleaning solution that works great on depth finders and anything else. The packets are something like 1.5″ square and you can stick a few in any convenient storage box. You open it, clean everything from eyeglasses to sunglasses to depth finder or instrument faces. Then toss it in the trash. Been using em for a couple of years and I trust them on some Carl Zeiss transition eyeglass lenses which do not come cheap.2008 Pantera Classic2014 Mercury Pro XS 200