How to remove a Stain in my antique porcelain sink?

try Mr. Clean magic eraser first,Bar keepers friend

Hey there, ok I had an ancient cast enamal sink that, at one point, had been white. What worked best for me was a mix of baking soda, hydrogen peroxide and vinegar. Create a paste and then leave the paste on the stain for at least 48 hours and than scrub with bleach and REALLY hot water. I repeated this three times and my sink almost looks like new.

Try Barkeepers Friend. Use a soft rag and rub in circles. Rinse well.

Mr Clean sponges

Try W D. Or rubbing compound

Bar Keepers friend mixed with baking soda. Let it sit for about an hour and gently scrub it off.