I've been out in the rain a few times recently and the lenses of my scope and bins have got wet a few times. There are no big lumps of grit or soil as far as I can tell. However, a film of residue from dried out raindrops has developed.
I would like to clean this off, but am concerned about damaging the glass or removing the expensive coatings that the optics manufacturers tell us so much about. I'm not sure if this is relevant, but the scope is a Hungarian 8 x 56 S&B and the bins are Kahles 10 x 42s.
I'd be very grateful to hear the best way to clean them. I was tempted to go at them with some spit and a hanky, but thought better of it.
Thanks for your help.