Taking a page from the eyewear and lab optics industry, I had good success cleaning with these two products.
1/ I sprayed the solution onto the Kimtech tissue to dampen.
2/ Then very very lightly dabbed a small area, then using new section of tissue.
3/ Repeat with a new lightly damp tissue until a flashlight shows it is clean - there might be a trace of moisture, it'll evaporate. Never dry tissue! no side to side!
https://www.amazon.com/dp/B075L9ZTPB...ing=UTF8&psc=1
and
https://www.amazon.com/dp/B0051QFSCI..._NX3NKiisV9E4g
s)