How to clean an electric kettle
While it is not dangerous to drink water that is boiled in a kettle with lime scale deposits in it, it is rather unappealing. It also has the unfortunate side-effect of making your kettle less efficient, as it has to work harder to heat up the water. Using the method below will solve both of these problems.
Put 1/2 cup of water and 1/2 cup of vinegar into the kettle. Bring to a boil and let it sit overnight.
In the morning dump the mixture of vinegar and water. There will be chunks of lime-scale in it, so be sure that you have the stopper in the sink to catch them, or dump the mixture outside in an appropriate spot. Check to see if all of the lime-scale has been removed.
If all the lime-scale is gone, put about 1 cup of water into the kettle with either a tablespoon of baking soda or a small amount of lemon juice and bring to a boil. This will remove the odor and taste of the vinegar.
If there is still some lime-scale on the element, repeat steps 1 and 2 over again. Then rinse with the mixture of water and baking soda or lemon.