Regarding bumping ads in the classifed forums, we've just installed a new (customized) add-on that will change the way ads are bumped to the top. Please refer to the post "Bumping Classifed Ads" for details.
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How about Bar Keepers Friend? I've never used it on an item with just nickle plating, but it might be worth a try. It does contain a bit of OA and doubt that will do any harm compared to an OA soaking. It's cheap and good for cleaning other things if it doesn't work on your nickle plated items.