A Pocket Full Of Clean - Lenspen
I keep a lens cleaner in every camera bag I use, and as a result whenever I need to clean a lens or an LCD screen out in the field...I do not have anything to do it with. You see, I am nowhere near the bag when the gnu splashes mud on my lens. So either I spit on a handkerchief and scrape it off, or resign myself to shooting brown blurry pictures.
Things will change. The Lenspen people have put a display in the shop and I am going to get one or two that I can carry clipped into my pocket all the time. There are several sorts that they make - ones for LCD screens, or tablet screens - others for compact camera lenses and regular DSLR lenses. You can buy them individually or in a complete set, and they aren't expensive - $ 14.95 for singles ot $ 34.95 for the complete set.
They really do look like a pen, with a pocket clip and all - but inside the body there is an extendable soft brush for dust and a felt pad cleaner for the optical surfaces. It is impregnated with a fine carbon cleaner and is not damp - you never need to worry about dripping or wet spots. Between the two ends, you can cope with dust, fragments, fingerprints, and gnu mud.
Apparently these are the favoured product for a lot of videographers as well. Please pop one into your safari suit for your next documentary.You might get it in the daily gnus.