Vinegar, likely (definitely, if the residue is chiefly lime). Ordinary white vinegar can be diluted w/H20 as much as 1:1. Simply run thru a boil and (mostly) cool cycle; discard remaining liquid; rinse, repeat (if necessary).

In reply to Re^2: I usually boil water for tea using a(n) ... by ww
in thread I usually boil water for tea using a(n) ... by ambrus

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