FWIW, an acid bath is going to remove the bluing on the rear sight.
As the current finish is already damaged, I think I would hit it with a green scrub pad (maybe give it a brushed look). Metal polish might be worth a shot as well.
I have a small compressor and used a hand held blast gun (about$20 from Harbor Freight) to redo the slide on my CW45.
Regards,
Greg
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