Update: I called Heirloom to see what it could be and the nice lady explained that powdery mildew doesn't wipe off easily. This wipes off easily. She then stated that they spray with some kind of .. stuff (she didn't know exactly what) to prevent blackspot/mildew from developing while in transit (that's reasonable).
Let's just see what happens. I'll try to get pictures tonight if I don't get washed away with these massive storms!!
