I poured in ~ 1/4 pint of the super-dry methanol through the eyebrow lamp hole and swished it around for 2 minutes. Poured it out and then dried it with a heat gun, lens UP.
I repeated this 3 times. The results were surprising: What I would have sworn was poor polishing on the outside turned out to be an even coat of contaminated condensate on the inside. Each iteration of this "rinse and repeat" step increases the ratio of gook to solvent.