To remove the black corrosion use Muriatic acid mixed with water and a stainless steel wire brush. Larger bits can be mechanically removed using a piece of brass, I use brass rod or a brass punch to put pressure on the corrosion which it then flakes off.
You use a stainless steel brush so metal of the brush does not transfer to the blade or barrel (brass etc. if using brass brush).
Proper ventilation and rubber gloves is a must with this stuff. It may take more than once to completely remove the corrosion.
Adjusting the concentration allows for minimum or maximum chemical removal of corrosion. Complete rinsing in water after is necessary or the part cleaned will rust. Addition of Renaissance wax a good idea and will darken the surface a bit but remains in the white.
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