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Maybe this will help:
https://www.worldcoppersmith.com/clean-copper-pans/
I've heard of using barkeeper's friend as well but I've never used it on copper.
This may help: https://www.hometalk.com/diy/clean/house/how-to-clean-copper-bottomed-pots-28611511
How to Clean Copper Bottomed Pots
Essentially an abrasive coupled with an acid, are what is typically used.
Hello Valjean, hope this helps you
I've used ketchup, and also tried salt on half a lemon. Both require some elbow grease, a bit of scrubbing and a good rinse. Dry it when you are done.
Here's a tutorial that might help - https://chascrazycreations.com/copper-cleaning-hacks/