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?
It’s what professional window washers use. Just some Dawn dish soap and tap water. Because the dish soap will cut any kind of skin oils that may be present on the lens, the same way it cuts food grease.