OEM turbo manifold corrosion

[ntfrendlyGR]

Took stock turbo off, 2k miles on it, and noticed after sitting on the bench for a week every runner has corrosion in each of the runners. Almost looks like liquid ran into each runner and dried. I’ve never noticed this in any of my other turbo vehicles. Not really worried about it but trying to understand why.
Could this just be from the meth injection as I just run straight VP m1?

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