I made a newb mistaken: Carbon Dovo + Ultrasonic cleaner = Not a good idea (Photo)

[TomTomTuning]

EDIT: I meant mistake, not mistaken.

So I received a beautiful second hand Dovo La Forme today.
Like my DE razors, I thought it would be a good idea to clean it up in a Ultrasonic cleaner and then perhaps soak it in barbicide.
I guess I was wrong.

I washed off the oil the seller had applied and then soaked the blade in the ultrasonic cleaner for one cycle, it had a few drops of Blitz Gem solution in it.
After removing the blade I noticed these dark marks on the razor, they're only on one side.

After posting this in a few Facebook groups, I now know carbon steel + water is not a good idea.
I know it should polish off but I'm concerned about ruining the gold etching, any suggestions on how I should approach this repair?

What polish would you recommend and what method? Q-Tip, cotton ball, paper towel, microfiber towel, etc?