You don't need to worry with most headsets (don't know about AVP). I've been sweating in VR headsets for years and it never did any harm. I saw in the AVP reviews that it has a removable and swappable facial interface, so it should be easy to clean; the same is true of other modern headsets, and before that you had third party face covers or disposable absorbant stickers you could put on the facial interface to keep the sweat away.