What kind of stain is this???

I just got this shirt two days ago and I was doing my routine in the bathroom and spilled some water on my shirt and then it dried up and these stains appeared. I have seen these on my other clothes before and can’t get rid of them. Idk what is causing it. Any ideas?

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How can I stop my laundry from coming out all linty? Especially my black clothes

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How to clean banana leaf sap stains out of wet cast concrete

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