One of the things that’s great about running a Rohloff equipped bike is how impervious to mud/dirt it is. The hub will shift as nicely clean as it will coated in mud and filth. This photo came from a proud owner of a Thorn Raven Sport on the Thorn Forum. I had a similar experience with my Rohloff equipped Surly Big Dummy on the Dempster Highway.
It’s not a question of the Rohloff still being able to manage a shift when covered in mud…the crazy thing is it shifts just as well dirty as it does sparkling clean. When all the rest of your gear starts malfunctioning because of mud it will blow your mind that your bike still shifts perfectly.