I had heard that there is an antifog layer on the inside of the lens, so you're not supposed to wipe the inside too vigorously, when getting the finger prints off. Not sure if it is the case (rookie) but sounds right.
I'd hope after a change or two that they'd soften up and it'd be a bit easier, but from what I see / hear in Niseko you can get away with clear lenses all day, and since you need clear for night boarding I'll probably put em in and leave em in. Considering my silver mirrors are about 35% night boarding would be impossible.
But yup, anyone who has so much as a square cm without finger prints on it the first time they change em needs a round of applause.