Greetings all. I am new to forum and hoping someone can offer some advise on how to remove a stubborn stain I have in my bathroom sink. It is less than a year old and believe it is vitreous china. I have used baking soda, white vinegar, and a mixture of baking soda and dish washing liquid. I am trying not to use a commercial abrasive cleaner. I have attached a picture of stain.
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