Just found a super easy way to take the black streaks off

CREATO wrote:
Magic eraser

Keep in mind that Magic Erasers are somewhat abrasive. I would be careful using them on many surfaces.

Info:
Melamine foam erasers work well; but on surfaces that are painted, polished or easily scratched, they might work a little too well. It's recommended to test the eraser on a small, preferably unnoticeable, portion of whatever you're looking to clean before you dive on in.