Lens manufacturers say that anything other than a microfiber cloth will damage the coatings on a lens. But microfiber cloths eventually pick up crap and they look like they’re a pain to wash.
How do you keep your lenses clean? Are you using cloth/kleenex or microfiber cloths? If you use microfiber cloths, how do you clean those?
I use denim. My jeans get my glasses cleaner than anything else I’ve tried. I’m sure it’s not as good for them as a microfiber cloth, but it’s what I have on me. My wife has me clean hers, too.