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There are a billion products out there for cleaning and polishing metal, so the one to use is the one that works best for you, but as a chemical engineer who has done a lot of corrosion related work I will second the notion that hydrochloric acid is NOT a good choice, as pretty as it might make the surface in the short run!
On our boat we use grocery store product called "Barkeeper's Friend", basically a formulation of Oxalic acid and mild abrasives. For stainless steel, brass, and bronze it works great. With a bit of a sit-and-soak, it is also good at removing rust stains from FRP.
Bill
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