I only had experience with soft water, so I had never imagined that mineral deposits could build up so much…
When I had a better understanding about hard water after one year, I realized the cause of the problem. I’m glad we didn’t throw away the kettle!
Because I had never clean the kettle, it took me a whole day to remove the deposits completely. Since then I use vinegar to clean it regularly.
The water stains are problematic also in the kitchen sink and the bathroom. Hard water is such a nuisance when it comes to cleaning :(