I soaked my Nuova Simonelli Oscar II's shower screen plate for cleaning and it looks tarnished. Is this bad?
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Well, it's useable, if that's your concern, and before the 2018 models, it was brass one, I believe it's called pre-infusion chamber, it has holes to evenly distribute water flow.
Thanks, yeah thats my main concern, so this is supposed to get tarnished like this? Or people generally don't wash this? I would assume this would come in to contact with some coffee oils and eventually need cleaning.
That looks like aluminum, and if so that surface corrosion/spalling seems inevitable and eventually may lead to need for replacement. "Lead-free" brass or SS would probably be more durable, at least IMHO. May have been changed by manufacturer for cost savings.