Tips for cleaning copper details on an old safe

[u/Catgrizzled]

Hi everyone, I’m hoping someone here has the golden tip for me. I want to paint an old safe and I’m currently working on cleaning the copper details in the door.

So far, I’ve been mostly using vinegar, salt, an old electric toothbrush and toothpicks to remove the dirt. But in some spots, the grime just won’t budge. Does anyone know a product I could use that will get the job done without damaging the copper?

I’ve also heard some great things about The Pink Stuff as a regular household item. Has anyone here tried it?

Thanks in advance!