When it's not too hot, replace the filter, then close the lid again. Now it's time to tackle the outside of the kettle. Hopefully, at this point, you'll only need to wipe the outside down with a ...

Another sign that it’s time to deep-clean: If your kettle has a replaceable filter behind the spout that’s clogged with grit. The grit is almost certainly bits of the deposits, which you can ...