Hi, I was out doing some observing last night and a large amount of due got on my equipment. Everything looks alright but the eyepieces look pretty dirty, so I was wondering the best way to clean them. I have looked on line a bit and some places suggest 91% pure isopropyl alcohol and some suggest distilled water. I am just wondering, does anyone have any advice on the best method and what to use to clean eyepieces? Thanks for the help.