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.
Yeah that actually is another good point to it if you use it on aluminum it will erode the surface. If my quarter sheet pans get out of control I’ll do it to them a couple of times and sand them back down before I recycle them.