Degrease then perma blue cream followed by blue and rust remover, navy jelly and 4-0 steel wool
Navy jelly will lighten brown or blue, but won’t remove it well. I thought it would leave it clean, no such luck.That looks great . . . I would have thought the navel jelly would have removed all the bluing. . . I've only blued and then cut it back with scotch bright pads, as mentioned here.