How do you give a fennec fox a bath?

Because I plan to get a fennec, I've researched them extensively (I don't have the money yet, so that's what I've been doing), so I've seen/read about everything I need to know, and could know about them- except how to give them a bath, like, do I just wash them with water? Because that doesn't seem right- because they don't really have water in the desert, so would I like, give them a dust/sand bath, like chinchillas? or what?