Kimwipes with ROR/Zeiss/Acetone does the job. If you keep cleaning and can't get it off, then the material (microfiber, etc) you are using is contaminated. I don't like microfiber cloths for super cleaning.
I also use something I bought a long time ago called Opticlean. Paint on peel off. Nothing is left on the glass with that stuff. Pretty pricey though. You can also use collodion if you are a wetplater. Same method.
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