Ordinary white vinegar will remove bluing. On a piece like an extractor, where you want to remove only the bluing on the sides, a lot of care is needed. Otherwise you can just leave the parts sit in vinegar for a while and rub gently.
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My avatars are the Bulgarian word for "Fire", as seen on my 1900, 1906 and 1908 Bulgarian Contract DWM Lugers.
Looking for a DWM Commercial side plate #95
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