Black tarnish on selector switch

Hello I have a eico stereo 40 that has a very tarnished selector switch. I tried caig deoxit and it's not removing the black tarnish what else could be used maybe Brasso?

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Description: 2 Pole 7 Position design, plastic metal material, easily turned.Comes with mounting nut and black plastic knob, no worry about knob size

2P7T 2 Pole 7 Position 2 Deck Band Channel Rotary Switch Selector with Knob

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