I've never seen a hammy clean right after a pee...I'm guessing it would be gross?
A few times, I've been handling the hams when they took a pee break (on me, or elsewhere...) and its natural its damp for a moment. Doesn't seem to remain that way for long though. After a pee is normal. All day is not.
Pook is around sixteen weeks now, and his pee and poo escapades could fill a dozen leather bound volumes.....