Last year, someone mentioned that a Q-tip wrapped in Teflon tape works very well in cleaning lenses. I tried it on my Spyder's lens, and it worked like a charm. However, I've recently noticed a few circular markings on the lens that would not come off. I've also tried compressed air, but it didn't seem to work either.
Is it possible that I have damaged the AR coating on the lens?
Is it possible that I have damaged the AR coating on the lens?