If you do alot of hunting ,your fletching's are going to get wet anyway's whether your shooting feather's or plastic's. If you've got mud on them ,just let them dry out and the most of the mud will fall off anyway's .

If your shooting Feather's ,there is a water seal that you can use on them ,to help protect them ,just spray them when they're dry and your good to go . Don't worry about getting them wet ,if they fall off then just replace them.

nubo