How to clean stubborn black spot/stain? (Tudor Black Bay Bronze Slate Grey)

[RollieHunter]

Dear All,

Any idea how to clean the black spot/stain on my 1 month old ZF Tudor Black Bay Bronze Slate Grey?
I have tried using vinegar....it did clean some of the patina away, but not this stubborn black spot.
Any suggestions will be deeply appreciated.

 

[Mav2000]

This is bound to happen on bronze. Anyway the easiest way to clean it is with tomato sauce. Just leave a bit of sauce on that part and clean off after a while.