Here are some great tips from experts: https://www.worldcoppersmith.com/clean-copper-pans/
Hi there are some tips here:
when in doubt, ask Martha https://www.marthastewart.com/270759/polishing-copper#:~:text=%22If%20you%20have%20a%20large,tarnish%20will%20come%20right%20off.%22 ;
Hello, hope this helps you out,
here is more info for you
Heres a link that might be helpful.
Hi Chi: My go to is Barkeepers Friend. It works really fast and doesn't scratch the finish. You can get it at most grocery stores. Good luck
Hi! Acidic solutions are the key, for me. I've used ketchup, and a lemon dipped in salt. Both work to remove the tarnish and buildup. Good luck and stay safe!
Try this: https://www.hometalk.com/28611511/how-to-clean-copper-bottomed-pots
I use cerama bryte...it's like bar keeper's friend. I've also used ketchup...
Check all those tricks https://www.pinterest.com/search/pins/?q=Clean%20copper%20pots%3F&rs=typed&term_meta=Clean%7Ctyped&term_meta=copper%7Ctyped&term_meta=pots%3F%7Ctyped
Barkeeper Friend, Baking Soda and & Vinegar, Stand in Coca Cola over night.
Here's my tutorial - https://chascrazycreations.com/copper-cleaning-hacks/