How to clean an induction stove from overheat?
It depends what the 'stain' is. If it's just surface deposits from the bottom of the 'teapot' (kettle?) transferred to the stove top, use a recommended proprietary cleaner (depends what country you are from what is available, ask at a hardware store for ceramic hob cleaner or induction hob cleaner). If it's in the bulk of the stove top caused by heat damage to the thickness of the material, you have two choices... live with it or replace the top. You won't be able to polish out the stain as it goes through the thickness.

Side note, that's probably why many induction hobs are black or very dark... harder to spot if there is any discolouration caused by getting a pan way too hot.