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?
Unfortunately I cannot answer that question. Opticians don't use alcohol to clean glasses, they often use white spirit to clean lenses. Alcohol can potentially damage your frame (if it's a 'plastic' one).