Note: This post previously featured a video of rabbit being given a bath. Turns out it's not a great thing for them. Organizations such as the House Rabbit Society and the U.K.'s Rabbit Welfare Association discourage the practice of bathing a rabbit, and suggest that it should only be done on a veterinarian's recommendation. The video previously in this space has been removed so as not to encourage the practice. For further information on best methods for cleaning a rabbit, one can refer to this guidance from Pawnation, or watch this video from Howcast.
You Shouldn't Bathe Your Bunny (UPDATE)