Thank you for that tip of lemon juice. The method that I have been using for years is vinegar. You cover the build up 1/4 to 1/2 deep, then bring it to a boil for a minute and pour out and put fresh water in and bring to another boil and again pour out. This does a good job also.
Vinegar is a frugal natural room freshner (once the smell dissapears) and it removes mineral deposits. I fill my kettle or coffee pot with vinegar, heat it, then turn it off to sit for 2 hrs. Dispose of vinegar, it freshens your drains, then run clear water through your nice clean pot.
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