Hi, I got my hands on two 7.5 cm KwK 40 shell casings - I am trying to clean them to look like new - there are some black rust spots. Somewhere on the internet, I found a mention that this is a steel case, but the color and nice ring would suggest brass - maybe only brass coating?
I would be happy if anyone could tell me something more about those and give me some tips on how to clean it (also the insides)
I already tried using vinegar and rubbing it
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