You can pickle it clean with pickling paste which you buy from a welding materials supplier. The acid within the paste is nitric acid so a bit aggressive and I've only seen it supplied in fairly large tubs or bottles. You can give the oxide area a good scrub with a wire brush instead, it's not as good but it is ok. Alternatively, you can paint stainless steel by normal primer/topcoat after thoroughly cleaning/degreasing it or, as I have done, paint it with a good exterior paint. I used garage door paint from B&Q and it's been on the boat since 2005 and is still there, though it's lost its sheen a bit (It was satin finish).
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JW.
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