I have only ever used Windex with Vinegar, (no ammonia), and MAD Glass Cleaner on my Garmin electronics. I want to put some glass protectors on as I've already had a few close calls with egg sinkers flying around. But, I can't get rid of this film on my electronics. I can take my finger, even after cleaning, and smear this film around.
I want to be really careful what I use but I'm open to any suggestions as to what to use. I really want them crystal clear and clean before I apply the glass protectors.