crap that's filthy, if you don't have alcohol handy [I find lens pen tend to dry fairly quickly] I often just use blue windex for my e's, but then again I tend to wipe them over fairly regularly
cotton bud are fine, I avoid lens tissue, I find it too abrasive if you don't use it soaked
I also have a large box of zeiss lens cleaning wipes, they are like KFC moist towelettes, in mini foil packs -they work great
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