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
Pressurized portafilter vs traditional filter holder: which is the best technology? | Caffè Italia
Amazon.co.jp: Toysmith Espresso Coffee Handle with Naked Filter Holder for Coffee Machine, Plastic Handle : Home & Kitchen