I hate to bring up this contentious issue , however, I notice the list of things to avoid when cleaning miscroscope lenses.
Here I am only asking about glass refractive optics. Specifically , the link suggests, do not wipe with ordinary tissue or wipes, only pure cotton swab or specific lense tissue. Perhaps dabbing or absorbing is ok but that is not the cleaning system discussed and I think I will stick to pure cotton.
Interesting that starting with distilled water after blowing is recommended first and only then moving on to lense cleaner for oily spots or in extreme cases alchohol.
https://www.scientifica.uk.com/neuro...our-microscope