Krups Coffee Automatic

Krups Coffee Automatic
What is the best way to clean an espresso maker?

It says something in the owner's manual about descaling. I haven't done that. What does that do? I have used vinegar before. Does that help? My coffee starts to taste bad after a while of using. I use it pretty frequently (usually every day), but I haven't for the past month because I've been broke and have been drinking instant coffee instead!

Anyway, it's a krups duomo if that helps (it has the automatic drip coffee maker as well on it).

Vinegar will do the trick - or phosphoric acid dissolved in water.
I buy the latter ready-mixed.

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