Why are you using water , which contains impurities
I use alchohol impregnated lens wipes which you can buy over the counter for cleaning spectacles, it also evaporated quickly
Use a lens cloth to polish the glass as it dries off.
Do not over do the application of any liquids on lenses as over time it will seep through the the various elements of the lens causing them to part company and your bino's will lose their sharpness
Answers & Comments
Why are you using water , which contains impurities
I use alchohol impregnated lens wipes which you can buy over the counter for cleaning spectacles, it also evaporated quickly
Use a lens cloth to polish the glass as it dries off.
Do not over do the application of any liquids on lenses as over time it will seep through the the various elements of the lens causing them to part company and your bino's will lose their sharpness