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Although the Electric kettle has gotten some disgusting mineral deposits, so I've been using the microwave until I figure out how to clean that stuff :)
Malt vinegar! (Just) Cover the element or base of the kettle with it and switch the kettle on for a few seconds until the vinegar boils; then switch it off. Leave to stand for 1/2 hour. Rinse with cold water to avoid an unpleasent (but otherwise benign) aftertaste. (Also, avoid sniffing the fumes. Again, not dangerous, but pretty eye-watering.) <p?(For really thick deposits you may need to repeat a couple of times!)
Malt vinegar is cheap as chips and far more effective(*) than those overpriced -- and usually noxious kettle cleaning products you find on the market.
(*Calcium carbonate (chalk) readily dissolves in Acetic acid.)
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