What is the brown residue in kettles?

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Offline annie123

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What is the brown residue in kettles?
« on: 14/07/2014 01:19:15 »
I have a plastic electric kettle. I've had it a while and it's now coated inside with a very dark brown residue which I tried to get off with wire brush and it does come off eventually. But what is it? Do I need to clean it? I live in a soft water area and don't get this residue on any other appliance- at least, not where I can see it. Does boiling temp. make something come out of the plastic ?