Eye cleaner works great too as Lake said. Costco has their Kirkland brand that comes with two spray bottles and a couple microfiber towels. When you run out of eye cleaner, there's a dispenser of eye cleaner that they have there. As long as you have the spray bottle you purchased originally, you can go there and get refills free of charge.
#3804, "RE: Best product for water spots on fish finder screen?" In response to Reply # 0
Bought the $5 eye glass cleaner at Costco. Wow, awesome. My screens are clean in seconds. Cleaned my laptop screen and my monitor while I was at it. That's a great tip, thank you guys. Free refills are you kidding me? LOL.