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?
Worn cotton t-shirts work best. Launder without fabric softener or dryer sheets.
With plastic lenses, don’t use paper products, including Kleenex, toilet paper, napkins, or paper towels. Paper (wood) fibers are hard enough to put microscopic scratches in lenses or coatings, eventually making them appear cloudy.
Microfiber cloth is pretty lousy for cleaning lenses, in my experience.