Lead buildup will be obvious when you see it. It will be dull compared to the surrounding metal. The best solution I've found is the Lewis Lead Remover tool, along with a home brew cleaner known as "Ed's Red" (equal parts kerosene, acetone, mineral spirts and transmission fluid). There are some variations in the additives, so you might goodle "Ed's Red" to do you own research. Makes a very good, affordable lead remover that is safe to use on blued finishes. FYI, the Ed's Red by itself works pretty good, especially if you soak to bore and chambers right after shooting. Just remove the grips if they are wood.
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