Does anyone have any advice please?! We had been using a baking tray on the hob (it's an induction tray and we have a section of the hob designed for that) however the tray itself burnt, and now we are left with a large mark on the hob. The mark itself feels less polished than the rest of the glass. My guess is that the hob has burnt, and I don't know whether it's just on the surface. Has anyone had anything similar and knows of a way to sort it??