Well, this is what I did:
Took 6 dl 24% vinegar (acetic acid), mixed it with 10 dl water and put my HC in it. Let it rest in it for 3 hours. After that, I saw no difference. =) Took som steel wool (is that the correct use of words?) and gave the tanks and pipes a nice polishing job. =)
Looked like copper at first, but then more like gold, so I guess it's brass anyway. As for the fins, I don't know, they look like copper, but I cant get to them with the steel wool, so it's hard to say.
Used the water tap to flush through the HC afterwards, and got some, not much, black crap.
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