Whats the best way to remove what I assume to be white colored china marker from the barrel and frame roll marks on a blued S&W without damaging the finish? Ut could be some other sort of colored filler, I dont know. It was on the gun when I purchased it. I tried a soft toothbrush with a little CLP and its didnt do anything. Before I break out anything more aggressive I want to be sure I dont use anything that will damage the beautiful bluing on this revolver. Thanks
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