Limescale is a hard, chalk-like deposit made up of calcium and magnesium.
It is left behind when hard water evaporates. You will usually find it in the bathroom, in the kitchen, and most likely in a kettle. However, it is difficult to get rid of meaning most people tend to leave it.
We have some tips on how to effectively get rid of limescale. One thing you will definitely need? Elbow grease!