• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Transformer laminate rust removal?

Coke has been shown in videos as a scale cleaner for porcelain toilet bowls, so I think it was in context.
I have not tested it personally for that purpose, I prefer Indian flavors and non fizzy drinks. So I would have to buy Coca Cola and try cleaning toilets.

Due to its high sugar content and fizzy nature, it is said to be a potent spermicide, so some comments have been about using it after sex as a birth control agent.
Convincing the lady to put the stuff in her private parts could be difficult.
 
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Things to consider are roughness and flatmess.
Curved surface will induce hum, and a pitted surface will not couple properly, so eddy current and hystereris losses may be high.

For an audio amp running 4 hours a day, and with conservative load, not a big problem.

Process is called electropolishing, reverse the polarity with respect to that used for plating.
You may need to use a surface cleaning agent like mild acid before starting the process.