Timothy Murphy

I live with very hard water and stainless kettles hold up fine with weak acids. tbh Start with a mix of one part white vinegar to two parts water or use citric acid at about a tablespoon per half liter. Heat to a boil, kill the power, and let it soak for fifteen to twenty minutes. Pop out the little mesh spout filter if you have one and drop it into a cup of the same solution while you wait. Afterward dump the solution, give the inside a gentle wipe, then rinse a few times and do one plain water boil and discard. I tried vinegar first then switched to citric acid because the smell bugged me, same result. Do not soak for hours and skip any scouring pads because they will scratch. Easy.