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Just an FYI: while baking soda will work great to remove the old coffee oils, it won’t do anything to the hard water buildup and scale that accumulates in coffee makers over time in places that have hard water. Citric acid dissolves it through acid-base reactions, whereas baking soda is a base so it doesn’t touch it. Also, baking soda will leave white powdery residue in some coffee makers that is quite difficult to remove (speaking from experience >_< ). It will also change the taste of your coffee if you don’t get it all out - removes the acidic bite that makes some coffees so good.
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