![I accidentally left my espresso machine's filter holder in a espresso cleaning powder solution overnight instead of for the recommended 30 minutes. The only ingredient listed is sodium hydroxide. Is this tarnish/residue I accidentally left my espresso machine's filter holder in a espresso cleaning powder solution overnight instead of for the recommended 30 minutes. The only ingredient listed is sodium hydroxide. Is this tarnish/residue](https://i.redd.it/82u8mjoug7x71.jpg)
I accidentally left my espresso machine's filter holder in a espresso cleaning powder solution overnight instead of for the recommended 30 minutes. The only ingredient listed is sodium hydroxide. Is this tarnish/residue
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