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You can get them clean again, but I think you basically have to scour them with pumice, which you can probably only do so many times.
Edit: Oh, you’re talking about enamel, I’m talking about porcelain.
They’re the same thing. Enamled in this case means there’s a porcelain coating.
It’s the smoothness of the surface that’s ultimately responsible for the acoustics. That’s why walls are typically textured to some degree.