Yes, but the rest of them isn't; I keep finding dehydrated frogs that the cats have brought in and forgotten about, usually behind the wardrobe or under the bed.  I use soap -sometimes shampoo- on the really dirty parts of the bow hair.  (I'm not classically trained, so I hold it in the older style, which does involve some transfer of grease from the thumb.)  It can be dried with a hair-dryer on a low setting if you're in a hurry, and are careful.  I've come across people who never clean their bows; just get them re-haired when they get dirty.  More money than sense, I'd say.

Malcolm