Sink Ceramic

How to get black marks out of a ceramic sink?
I have a white ceramic sink has black marks on their pots and pans. I tried a gentle wash with bleach did not work. Suggestions?
Do not laugh at him, but I saw this in a store but was in the boxes. (White) using a tennis ball. Law took black marks on the floor! Since then try the magic eraser. Try a little salt and gently rub.