If those lifters were mine, I'd verify that they still have some crown. If they do, I'd pull 'em apart ONE AT A TIME for cleaning and inspection of the guts.
Assuming they look OK inside, I'd put a piece of exceedingly-fine sandpaper (1000 grit?) in the palm of my hand or on some firm closed-cell foam like a better-style water-ski life vest, twist the lifter foot against the sandpaper for about two seconds, wipe 'em off with a soft cloth perhaps with some solvent.
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