If you notice a stain on the bottom of your kettle's interior that resembles rust, don't worry! It is likely not rust, but actually a harmless buildup of minerals called limescale. Limescale is a direct result of heating up water and thus inevitable with all kettles. Depending on the mineral concentration in your water, it is bound to show up sooner or later.
To get rid of limescale, try heating up a 2-to-1 solution of white vinegar and water in your kettle. It doesn't need to reach boiling, but heating it up to 185°F should do the trick. Keep it heating on for up to an hour before emptying it out. Afterwards, rinse out the kettle with fresh water to get rid of residual vinegar. If you notice lingering traces of vinegar, you can mix a teaspoon of baking soda to a filled kettle as you're rinsing it out. Baking soda does a good job of neutralizing the scent of vinegar.
For stubborn limescale buildup, repeat this process a couple times and/or consider leaving the vinegar solution in your kettle overnight. If this does not resolve the issue, please reach out to us and we'll take care of you!