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I did try alcohol swabs (for cleaning wounds and such), with no effect. I am hoping not to have to actually manually clean each and every groove, due to the fine pitch.
I was expecting you would use the cotton swab on each groove. But, if there is no affect, possibly DI water applied the same way. I know that it would be time consuming, but, it would be worth trying at least for a small number of the grooves to see if it is worth continuing to complete the entire lens.