Here are a couple of methods for cleaning your pan.

https://www.wikihow.com/Clean-Copper-Bottoms-on-Pots-and-Pans

Janis: maybe this will help

https://www.huffpost.com/entry/how-to-clean-copper-pan_n_6600468

Here is a simple home remedy to follow. https://www.google.com/amp/s/todayshomeowner.com/video/how-to-clean-copper-pots-and-pans-the-easy-way/%3famp

Very good information here:

https://www.mr-maid.com/blog/5-easy-ways-clean-copper-cookware/

Barkeeper's friend

Lemon juice of vinegar with baking soda, mix into a paste.

Ketchup.

Any of these buffed and then wiped with a clean cloth.

I always use ketchup, cheap and readily available., Just apply and let it set about 15 min, wipe off and enjoy your copper bottom pan.

https://www.hometalk.com/8759744/how-to-clean-copper-bottom-pots-with-just-2-natural-ingredients

https://www.hometalk.com/28611511/how-to-clean-copper-bottomed-pots

https://www.hometalk.com/16577250/a-unique-way-to-clean-your-copper-pots-

Clean Copper Bottom Pots With Just 2 Natural Ingredients!

How to Clean Copper Bottomed Pots

A Unique Way to Clean Your Copper Pots!

Sprinkle it with salt and add vinegar to make a scrub.

Hi Janis: I use Barkeepers Friend on mine. It's quick and easy. Just wet the bottom of the pan, shake on some of the Barkeepers Friend and wipe with a cloth or sponge and rinse well. You can get it at any grocery store by the cleaning supplies. Some use catsup, but that leaves a greasy residue that will, eventually, turn a tarnished colour and is a bit hard to remove. I don't care for that at all. Once you clean the bottom of the pot, be sure to wipe it dry so that it doesn't get a water stain. You want to use something that doesn't scratch the surface, and Barkeepers Friend, or even Bon Ami, doesn't scratch. Good luck

I use ketchup as soon as it starts to discolor. Keeps it nice and shiny

Hi ! Try ketchup !!! Rub it all over and let it sit awhile , then rinse it off !

https://www.hometalk.com/28611511/how-to-clean-copper-bottomed-pots

How to Clean Copper Bottomed Pots