How do I clean pitted and tarnished brass lamps?

How do I clean solid brass lamps that are pitted and tarnished and have a "protective" sealer coat on them? These are Stiffel lamps guaranteed to NEVER tarnish or pit! I called the manufacturer but could not get any help other than return the lamps to them for cleaning and rewiring. They would ONLY charge me $1,200/lamp!!!!!! Hopefully, someone has a less expensive method!

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