Here's a link for cleaning copper kettles:
Hi Jane: You can use Barkeepers Friend, it's a non-scratching powder. Good luck
I have found ketchup works very well for copper cleaning, just go with the grain of the kettle using a soft rag so it will not be scratched. Leave the ketchup on for about 1/2 hour and clean off in warm water.
I like ketchup too. It works well and is gentle on copper.
Ketchup works great!
Ketchup works great and is cheaper than specialty copper cleaners .
Thank you all . I also tried l fresh lemon and table sale. Looks like new.
Should be lemon and table salt.
Fresh lemon and table salt cleaned it like new.. thanks for all who answered me.