I had lost hope with my electric cooking plates. The white circles where completely hidden under a layer of diamond-grade burn residue that no amount of scrubbing with chemicals could even begin to remove. I found this 3€ scrapping tool and it’s amazing !!! Sorry, but I don’t have the before picture, believe me after 6 years of usage, it was bad.
It’s specifically called a [glass/ceramic] stove cleaning [blade/scraper]. I’ve used one a lot and it doesn’t seem to do noticeable damage (glass stove tops need to be pretty tough anyways to handle regular cooking)