How do I clean a brass sink?

Check to see if it's really brass. ...

Squeeze half a lemon into your bowl.

Add your baking soda. ...

Stir the baking soda and lemon mix until it forms a delicious smelling paste.

Use a soft cloth and apply the paste. ...

Rinse off the paste and dry. ...

When you're done, give the brass a really thorough rinse.

Hello. Make a paste with baking soda and lemon juice. Here is a link. Happy New Year!

https://www.apartmenttherapy.com/how-to-clean-brass-using-2-natural-kitchen-ingredients-141104

Your sink is aging and is getting a patina on it. If you don't like the natural patina, use a commercial brass cleaner on it continuously. Commercial brass cleaners like Brasso have ingredients in them to keep your sink shinier longer than any DIY product you can make.

I don't think it's brass looks like hammered copper to me. Cannot use anything abrasive or acidic on it it will ruin it. https://www.youtube.com/watch?v=8QQeTfXOiX4 MORE https://www.youtube.com/watch?v=aO2Cd4CV0U4 I use BioCleaner made from clay ,cleans polishes and leaves protective coating on all my copper,stainless,black glass stove top & more. Maybe can get it on Amazon or QVC.com well worth the money little goes long way easy to use.

Not brass. Copper.

Catchup cleans brass and copper. Smear on and you won't believe the difference.

I have these same sinks! They are hammered copper, I clean them with Bar Keepers Friend. I’ve used Brasso and Twinkle, the BKF does as good a job without the horrible smell! See pictures below.