I am about to overhaul the two Bing carbs on my 912 ULS.  Some of the brass parts are covered by a thin but tenacious gray film -- some form of tarnishing I suspect.  Can anyone suggest a safe effective way to remove this tarnish -- a simple dip / washing perhaps?  Thank you....

ps -- I've been using 91-mogas with ethanol for 95% of the past 1,200 hours.

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