Free: Contests & Raffles.
I do.Cleanliness.It's mostly to make absolutely sure every piece of hair or dirt is cleaned off.That is why I do it anyways.It only takes a few minutes and it's not like you wash away the flavor.I see benefits with no downside.
I prefer to hang them dry and brush off any hair. Hosing them off is a last resort if things get really messy with a gut shot animal.