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Try acetone or laquer thinners, with a rag or 0000 steel wool and an old toothbrush for the nooks and crannies. Don't use any of those green 3m scrubbing pads, they will harm the bluing.
Acetone. Took several coats of camo paint and clear off an 870 which the previous owner had made it his turkey shotgun. All the paint came off with no damage to the original finish.