I found this German kriegsmarine double decal helmet in a bunker in Norway a while back.

Since the bunker is a " Costal defense bunker" and it is located near the ocean, it has been attacked by the "sea air" even inside the bunker.

How should I clean it without removing the original paint and decals?
I live in Norway and I have read about this "oxalic acid" stuff on this forum before, but I don`t know if this product is available in Norway?

Thanks

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