Well, I don't know, but I assumed that you should follow the same idea, ie. remove old coffee residue so that it doesn't taint future brews. That's why I qualified it with "espresso machines".
@hippy started
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Well, I don't know, but I assumed that you should follow the same idea, ie. remove old coffee residue so that it doesn't taint future brews. That's why I qualified it with "espresso machines".