If you have a metal scrape on your porcelain, there are a few ways you can remove it. First, try using a Magic Eraser or another type of eraser. If that doesn't work, you can try using a mild abrasive like toothpaste or baking soda. Apply it to the scrape with a soft cloth and rub gently in a circular motion until the scrape is gone. If neither of those methods work, you may need to sand the area lightly with fine-grit sandpaper.