Using a plain
steel wire brush leaves minute pieces of
steel in the part being brushed. Makes for a wonderful rusty mess until all the little particles all corrode away. Might be able to passivate it with acid if you do use a ferrous wire brush.
Best thing is to have the plater galvanically remove the chrome then buff out the pitting before rechroming. Cheapest is just to live with it.
I'll never have anything powder coated again. Once
corrosion begins under it, it comes off in large blotches. When the
corrosion starts, it's never ending till all the powder coat is gone. Best to properly prepare the surface and
paint using the
paint suppliers
aluminum paint process.