Heating Cooling Units

What is the best way to get mineral deposits off the heating elements in my warm mist vaporizer?

Basically, There are two long, round the vertical heating elements that boil water and make steam. Mineral deposits accumulate them and reduce the efficiency first. Every week or so I have to scrape with a knife that can not be the best solution. I tried soaking in viniger but does not work very well. Thank you for your suggestions!

Good suggestion. Preferable to replace the same field. Otherwise, it will not work.

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