1 tablespoon of table salt and 1 cup of white vinegar with a soft cloth then either rinse or wipe clean.
I think lemon juice and salt works, but there are commercial products available.
Cecelia: maybe this will help
Vinegar. Mix 1/4 salt, 1/4 cup flour and enough vinegar to make a thick paste. Use a soft cloth to rub the paste on the surface of the copper. Buff till it shines. Rinse with warm water and dry thoroughly.
You can make another natural cleaner by mixing lemon juice (or vinegar) and baking soda into a sudsy mixture. Apply to the copper and buff with a soft cloth. Rinse with water and dry. These mixtures work because the acid in the vinegar or lemon juice strips the oxidized patina from the copper and the salt acts as a mild abrasive to remove the grime. You can also use lime juice instead of lemon.
Grab a bottle of ketchup for the third natural cleaning idea. Yes, ketchup. This is how to clean copper with a condiment. The acid in the tomatoes cleans grime off copper. Rub a thin layer of ketchup on your copper item and buff till it shines. Rinse and dry.
Dissolve salt in vinegar. Use a soft cloth to apply the liquid solution to the item, then buff till the copper gleams. Rinse and dry. If dents in the copper are holding any grime, use a soft toothbrush to scrub the copper.
If none of the cleaners we’ve suggested work, put one cup of vinegar, one tablespoon of salt and three or four cups into a large pot and bring to a boil. Put your item in the pot and boil it till the tarnish falls off the item. It may need more scrubbing when you pull it out of the pot, but you’ll need less elbow grease to get the shine back.
Once your copper is shiny again, keep it cleaner, longer, by wiping a thin layer of mineral or linseed oil on it. Knowing how to clean copper, how to clean a copper sink and how to clean copper bottom pans will make these items beautiful.
You can check this out: https://www.marthastewart.com/270759/polishing-copper
Ketchup and salt is the best way I have found to get a good shine.
Here is how to clean copper in 2 minutes: https://www.youtube.com/watch?v=BQoIsi0edJI
Hi Cecilia. Mix together 3 cups boiling water, 1 cup vinegar, and 1 tablespoon Salt. Stir until salt is dissolved and then clean your brass with it. Rinse with clean water and dry with soft cloth. Good luck Cecilia. I hope you are well.
There are lots of posts here on cleaning copper:
Vinegar and Salt
Rub a mixture of 1 tablespoon of table salt and 1 cup of white vinegar onto the copper with a soft cloth and rinse. Or, immerse the tarnished copper into a pot of 3 cups of water and the salt-vinegar mixture, bring to a boil and boil until the grime and tarnish comes off.
Check this out: https://www.hometalk.com/28611511/how-to-clean-copper-bottomed-pots
Vinegar and salt is doing awesome job
I use brasso cream cleaner and polish it works great .
Hi Cecillia: My go to is Barkeepers Friend. It's fast and easy. Just be sure you dry the copper off so that it doesn't get water spots. You can get it at any grocery store near the cleaning products. Some say to use catsup, but to me it leaves a film and doesn't look very good. Here's a site that should help:
Hi Ceclia, "If you have a large copper item and you want to clean it quickly, you can boil three cups of water, add a cup of vinegar and one tablespoon or more of salt, Next, you would stir until the salt is dissolved and then place the copper item in the water. "The tarnish will come right off." Hope this helps