Sorry this happened to your duck. You can clean the would with just warm water or wash it with water and then apply a watered down iodine solution. You can also put neosporin (without pain killer-no "caine" anything) on it. The problems with ducks is they constantly are getting it wet. I would keep this baby isolated for a while until you are seeing it healing and keep its water as clean as possible while healing. It doesn't look too bad and it should be ok. Hope this helps and maybe someone else can add to this.