I have some old brass and copper washed in a dishwasher, & it is dull looking now.
Just an FYI for future, never put copper, brass, aluminium or silver in the dishwasher, it ruins it. Dishwasher soap contains sand or other things that etches. All you can do is try to polish them, I like Brasso or Wright's polishes.
Hi Mary! Hope this helps: https://www.bobvila.com/articles/how-to-clean-brass/
brass you can use brasso to shine it
Hi Mary: You can use Barkeepers Friend, that works fast and I've been using it on my pots for years. As the others have stated, it's not a good idea to put copper pots in the dishwasher. Or, for that matter, any pot that has anything other than a metal handle in the dishwasher. The soap and heat will discolour it and it will look just awful:( Good luck
Hi, this should help
You can clean copper with a mix of vinegar and salt. Rub it on and then clean it off.
Mix 1 tsp of salt in 1 cup vinegar, add enough flour to make a paste. Put on your object for 15 minutes and then clean it off. Do not use ammonia products on brass or copper as it ruins the finish.