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that's limescale
Limescale from the tap, or a dirty dish with limescale.
Either way it's harmless.
This is why water softeners, aka soft water is a thing in many US homes.
The kettle doesn't have whitish looking residue though. It's spotty specks of grey that leaves chalky white powder on my finger when I wipe them, is that still limestone?
Yup. It takes a minute for the scale to build up on the metal.
Maybe the kettle has some kind of non-sticking internal surface?
Yes, that sounds like limescale.
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