Mix 30g (1oz) of the lemons or limes with 500ml (2 cups) of water.
 Leave the kettle to cool before emptying it.
 If there is any lime-scale left in the kettle, you can wipe it down with a small amount of bicarbonate of soda on a damp cloth. Let the element cool down, and unplug the kettle before you do this.
 Fully rinse the kettle with fresh water at least 5 times before using again.
Make the mixture.
Pour the lemon or lime juice in to the kettle and boil.
Wipe down.
Rinse.
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