Silly question about Fitting new brake disks

[Nidge747]

I suspect a VW mechanic may know the answer to my question.
I just got all new VW original discs to fit to my T6.1 but they have come with what looks a Matt zinc finish over the faces along with the labels rather than shiny faces, so my question is does this have to be removed prior to fitting and if so with what?
thanks for any help, in advance

 

[Dellmassive]

Just degreaser them before fitting.

(to remove factory protection)

Then brake clean them after fitting before fitting the new pads.

 

[Bigsidavies]

My guess is it’s an anti corrosion coating applied to the whole disc. I have some aftermarket discs that were completely grey. It stops the non-contact parts of the disc from going rusty. The coating on the face wears off after a few brake applications.

But still use brake cleaner to get rid of the oily coating that’s usually on them from factory.