Is their underfluff wet, or just their top feathers? Skin-damp is a lot worse than feather damp.
You can dry a chicken with a hair-dryer (my rooster nearly melted in my lap when I did this) That said, you may blow out your hair dryer on three chickens. It took me an hour to dry Chester off thoroughly. Looked good a week later--no ruffled feathers, everything was shiny and his skin wasn't dry--so I counted it a success and an "I would do this again")
I've also buried wet chickens in hay. They seemed to come out alright.