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.
Barkeeper’s Friend is a miracle, but people should know it’s incredibly abrasive and can debride enamelware. I ruined a pan’s outer finish because that didn’t occur to me, using it to get carbonisation off the bottom.
It’s brilliant for raw metal and glass cooktops, though. When I bought my house, the previous owners left a kit for the glass cooktop including the razor tool in your OP. I’m so grateful they did because I wouldn’t have known.
e: can’t spell