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Joke aside, I always spot those in poorly run "cafés", a great indicator of the cleanliness of the place!
Think I've mentioned this here before, but I've had a cafe owner start freaking out when he came in and I had taken the burrs out of the grinder for cleaning (for clarity, I was working there, not as a customer). That was a good (bad) indicator of their standards!
That filthy steamwand...