Limescale/ Tea stains
As the water evaporates, the insoluble calcium carbonate, magnesium carbonate and substances in tea become Limescale/ Tea stains. It's a normal phenomenon for this kind of product and it can't be avoided. We recommend using WHITE VINEGAR to clean the product regularly.
Remove Limescale/Tea stains: Filling some amount of WHITE VINEGAR into the kettle and let it stay in the kettle for over 60 minutes, then empty the kettle. It can help