Use something like Brasso found in most hardware stores or ACE.

Brasso is a metal polish designed to remove tarnish from brass, copper, chrome and stainless steel. It is available either directly as a liquid or as an impregnated ...
If the rust have gone in too deep better toss the bar
edit:
Maybe post a closeup picture of the rusted section.... seen workers use wire cup brush to remove rust from badly rusted metal gate once!! Might be overkill tho
This post has been edited by aaronpang: Feb 11 2016, 05:39 PM
Feb 11 2016, 05:28 PM
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