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 clean them with the hem of my shirt, always assumed this is what everyone does.
It is
Don't let Big Microfibre tell you otherwise
Big Microfiber
That's what I do, but it works better if I use glass cleaner.