How to Clean Your Camera Lens: The CIA's Guide

I've seen some pretty crazy things get recommended for cleaning lenses. A few years ago, Pop Photo said that Vodka worked. We've done a few demonstrations with Isopropyl alcohol. But a document in the CIA's archive is different. Their approach is a lot more like what an eye doctor would say today about your glasses. One would wonder why a document like this needed to be written. Well, of course, someone was messing up big time. And cleaning lenses with anti-reflective coatings needed a reference...