I'm really wanting to get 2 ducks as pets but, not having any before, I was wondering how everyone keeps their enclosure clean and the smell to a minimum. We're going to build a small shelter in an area in our backyard and section it off. The area we want to build is mostly dirt. With 2 ducks should the dirt be ok or will I need to add a layer of something? If I need to add, how do I keep that clean? We're going to make a little swimming area for them outside of the enclosure so we don't have to worry about the water from that getting everywhere. Any advice on how you keep their space clean and smell controlled I would really appreciate it!