Cafetiere, my espresso machine got scaled to death ages ago.
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If you have a wine making/home brewing shop near you get some citric acid. Put it into your machine with some water, and repeat until de-scaling is complete. I use this method on mine and I've now been using the same machine for over ten years.
Make sure you rinse the machine well before making coffee. The citric acid is a 'mild' organic acid, and is food grade so is safe.