This is more along the lines of a poll - Most of my horsey life, the mantra has been to clean the sheath AND the penis. Sometimes it's been "clean the sheath, the penis is not necessary, except to remove the bean".
My current vet is adamant that cleaning the sheath isn't necessary At All, and it's all about cleaning the shaft, and of course clearing out the bean.
I've found that cleaning the sheath helps reduce Yankee's itchyness, and my vet seems unhappy that I disagree with him (he's an old country vet, I do like him a lot and he's a great vet).
So, what's the consensus. What do you, and your vet, think is the proper way to keep a gelding's genitals healthy?