I just give it a good brushing periodically with a stiff wire brush. Knocks off most of the gunk. The rest is keeping it from rusting. (Because I brush it with a stiff wire brush.) 
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I just give it a good brushing periodically with a stiff wire brush. Knocks off most of the gunk. The rest is keeping it from rusting. (Because I brush it with a stiff wire brush.)