Black scratch marks on sink

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We have a new white porcelain sink and somehow someone made marks that look like scratches, but you can't feel them, it's just that they are visible. I have tried everything to clean them, but nothing works.
q how to get rid of black scratch marks on white sink, bathroom ideas, cleaning tips, painting
q how to get rid of black scratch marks on white sink, bathroom ideas, cleaning tips, painting
  43 answers