Wave Away has been out for a few years and continues to grow in popularity. I love the stuff. It works great on the screens of your fishing electronics, but I also use it for my laptop, phone and whatever else I find that needs to be cleaned. They have a great pro-staff featuring Brandon Palaniuk, Scott Martin and Brent Ehrler. All of these guys are well-known and some of my favorites. If they trust it for their electronics, it has to be good enough. Each of them is sponsored by a different brand of electronics and Wave Away is approved for use on Lowrance, Humminbird, Garmin and more. The product itself now has a brand new package that includes all you need to get started.
They are also running a "Stocking Stuffer Special" right now where if you buy three you get one free. Retail price is just $14.95 and it is well worth it in my opinion.