Easy Copper Cleaning Trick

I was scrolling through Pinterest and Google a few weeks ago and wasn't having much luck on my search for a chemical free copper cleaning recipe. I love my copper pots, and from time to time I like to do sort of a "cleanse" on them to brighten them up and make them new again.
Here is what I found to work wonders. It's only one ingredient!
 Ketchup.
I can't remember where I read that ketchup cleans copper. I believe it may have been on YouTube.

Anyway, Here is what you do:)
Take your Clean pot(or any other copper item)

Spread ketchup on all copper parts.(It doesn't have to be very thick)
Let set for about 5-10 minutes.(you will see the change almost immediately

Rinse.

Admire.

Simple as that.
Thanks for reading!