I'd take soft bristle brush and dust the lens while applying a little air. After that I'd use good ol soap and water! Ive cleaned mine this way many times.
I'd use the brush first for sure, then good old fashioned Windex and a COTTON cloth...no paper products!
Hate to disagree with Ingwe but never use ammonia products on coated glass of any kind, much better for cleaning copper out of your barrel than cleaning your optics.
Been in the glass industry 45 years and nothing works better than alcohol based cleaners ....sprayway is $2 a can at Costco.
