Seconding the dremmel approach. Worst case scenario: You destroy a nazi sword. Best case: You end up with with a cool denazified sword.

Grind down the swastika, and change to a smaller grit to get a nice and polished finish.

Not sure, but I think the eagle predates the nazis.

EDIT: Nope, the eagle is also a nazi and needs a dremel. There, that’s gotta be a brand new sentence.

EDIT2: Seems to be one of the many symbols that have been hijacked by nazis. Keep at your own risk.