My Lazy, Cheap and Green Way to Make Chicken Broth
If you make your own chicken broth from actual chickens, you can just go ahead and stop reading this post right now.
Keep a set of "outdoor clothes" for each child. Put these clothes on your child before they play in the mud outside, remove them when they come inside, and keep them by the door for the next outdoor adventure. My kids have outdoor pants and outdoor jackets (when it's cold). Wash the clothes when absolutely necessary.