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?
Same as my laptop screen/keyboard - I use a dab of Dawn (or whatever brand I currently use) and a moist very soft sponge and dry with an old teatowel.