Cleaning heavy tarnish on brass
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I would use Brasso, especially if it is an heirloom, but here is another suggestion:
https://www.bobvila.com/articles/how-to-clean-brass/
I recommend Tarnex.
Coke Cola - steep it in.............
I use good old Brasso. Available pre much everywhere that has a cleaning section.
Mix baking soda and white vinegar together to create a paste