What are the brown stains on my porcelain sink?

The brown stains on your porcelain sink are likely due to a large amount of iron in your water. This is closely related to the simple rust that you see on metal, which is iron oxide. Your water probably comes from groundwater that filtered through rocks containing iron-rich minerals on its way to the well.
 
Here's how you can remove these stains:
 
Use a moist sponge to make the inside of the sink slightly damp.
Sprinkle baking soda over the stain until it is completely covered.
Use a sponge or cloth to gently scrub in small circular motions until the stains are gone.
Rinse away the remaining baking soda after removing the stains.
Remember, using abrasives to clean a porcelain kitchen sink or bathroom sink can leave scratches on the surface of the porcelain and lead to discoloration. You should also avoid using harsh chemicals for cleaning porcelain enamel.


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