Those blue deposits are not patina, but chloride- or sulfate-bearing salts - look up paratacamite.
As these salts further oxidize, they release the strong mineral acids, and the corrosion cycle develops deeper through the thickness.
Patina gets thrown around too loosely - what you have is more likely dealloying corrosion, and you want it out.
There's not a better candidate for vinegar bath than brass.
This happens to be nickel silver, which is essentially nickeled-brass. This also happens to be a $4000 reel the owner didn't want wasting away as it sat on a shelf.
now it can grow a patina