Ultrasonic cleaning will remove loosely bound soiling (so that will include mud/clay/dirt etc) and will do better at getting into small spaces where a brush won't get (like pores or similar). With an alkaline cleaner (this is what you need for generic soiling), you can get a really good clean. The OP, however, it discussing oxidation - the copper is chemically altered over time. It is not dirty, it is different. It is a bit like a scuffed golf ball - you can clean dirt off but not the scuffs. To return to the original look, you have to actually remove the outer oxidised layer - you have to actually dissolve a small amount of your golf club. This is what the coke (phosphoric acid) is doing. The coke is actually not doing much anything in the way of cleaning, any cleaning effect is down to you having dissolved the surface of the club and that carries away the dirt. You are actually acid etching, not cleaning. Acid etching will happen with metals and metal oxides, but not paint so the paint is not a concern.
Using coke to clean wedges
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