I don't know the process to clean a tarnished firearm. However, if it is a very old one, or you think it has historical and/or monetary value, DO NOT ATTEMPT TO CLEAN IT. This can cause trouble in dating the weapon and will drastically lower its value. Collectors and appraisers like old, historic firearms as-is, with tarnish, rust and all.
One way of cleaning without damaging is to clean with 0000 steel wool and gun oil....
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