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brooklyngirl09

Hi, Looking for help on identifying what this white lines are?

6 years ago

There are these white lines on my bathroom sink stone. My kitchen was under renovation and I am thinking this happened after my contractor left.
I wonder if these are grout stains from him washing his hands . Anybody have any idea? Also, what can I do to remove this? I tried vinegar , baking soda , dish soap, but all in vain !!

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