In regards to cleaning surface crud off metal, use Hoppes #9. Wipe on and let soak in. A soft toothbrush will get the loosened dirt out of the engraving and other crevices. A needle will clean out screw heads. Wipe the barrels down as well. A little elbow grease will do wonders. Don't mess with the screws if you don't have the correct screwdrivers. Someone h as in the past and you see the result.
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