I’m curious why you are calling them acid stains? From where they are, it would appear that they are caused by mineralization in the water. So, in other words have hard water stains. The way to remove them is typically using a phosphoric acid as opposed to hydrochloric. Sometimes they are heavy enough to require a gentle touch with a pumice stone called pumie. Porcelain is pretty difficult to damage with acid unless someone was using a very strong hydrochloric.  
Those are my thoughts, I hope it helps
Joyce Harris
Sent from my iPhone

On Mar 6, 2024, at 9:58 PM, Yonara Barbosa <Yonara@marblekareusa.com> wrote:



Good evening all,

Does anyone have any idea on how to get these acid stains out of this porcelain sink?

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Thank you,

 

Have a fantastic rest of your week.

 

 

Yonara Barbosa

MarbleKare USA

 

Phone: 561-997-2636

Email: yonara@marblekareusa.com

PO Box #6536

Delray Beach, FL 33482

www.marblekareusa.com

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