How do I clean a very old, solid brass lamp that is absolutely filthy?

There are so many different opinions on the net! I wondered if any of our trusted talkers have done this and with what result? The lamp is actually a standing chandelier and is very intricate. Also, does anyone have an idea of value? Of course this is one of my CL finds.

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How do I clean a very old, solid brass lamp that is absolutely filthy?

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