How To Store And Display Awards.

[travel-north]

Looks fine, the "pink" will go within a few months. I've "played" with different clean techniques and the pink always turns back to the original colour after exposure to air.

Thanks. That's what I wanted to hear

Does anybody have experience in cleaning with baking soda?

Looks nice and clean. The only time my heart skipped a beat was when you mentioned toothpaste but apparently that did not do any harm?
I do not believe you could have taken off goldplating using your technique.
Sergei

I used toothpaste to reduce friction when I brushed the medal with a toothbrush to remove the dirt. But maybe it's not the best idea, although it doesn't look like toothpaste could have had any effects on the medal.