Alright, so I'm kind of a neanderthal, especially when it comes to gun maintenance. I guess that's why I shoot a Glock. Anyway, about 3 months ago I got my first two Trijicon RMR's. One rides piggyback on my TA11 ACOG (legit worldbeater setup, don't let the naysayers tell you about "chinweld") and the other on a G19.5 MOS in a Wang plate. The one on the Glock gets garbage on the lens because I daily carry it. I've swiped it with my shirt tail a few times because there were too many little frags of dot projection all over the glass, but I cringed while doing it.
What's the proper way to keep this lens clean and scratch-free for as long as possible since it's about a $500 investment?
Thanks!