For brass, any powerful solvent works, but then that also dissolves the protective clear lacquer finish many makers put on the model, which the "collector" would like to keep. If you're going to paint it, no problem

Back on the topic of records, I'm not sure what they call "Tricho" in the US, but I would be wary of anything that would "dissolve or soften" the foam, because it would probably also dissolve or soften the record too