I have a 2 year old Raymarine chartplotter at the helm. I've beenvery careful to only clean with soft rags and water but it now hasmany "streaks" or "smudges" for lack of a better description. Themanual says to clean with Isopropyl alcohol to remove "smudges". Thestreaks may be from finger oils/suntan lotion since people occasionallytouch the screen. I want to make sure I don't damage any coating oranti-reflective film. I'm also researching protector films likehttp://www.navprotector.com to protect the screen and make it easierto clean.What does everybody else do?