oh, now I know these things, so helpful to meWally Siebert aka Mr Scope advised me many years ago to use the same cleaner recommended for spectacles, but to use a soft cloth to wipe the lens, never, ever us a tissue, as they are made from wood pulp which contains particles hard enough to scratch the lens.
I used Kirkland brand Multi Purpose Lens Cleaner from Costco and a cotton cloth. First, I blew off as much as I could with a squeeze air gadget I use for camera lenses If you get one of those, throw away the brush attachment and just use the rubber part. Every photographer knows that. Then, a light spray on the lens followed by a light touch circular swabbing of the lens to remove the lens cleaner was all that was needed.Can you share? I'll never need to use it, but JIC.