I have 5 Buff Orpingtons, 1- roo and 4 girls. The roo has clean looking behind but 2 of the girls have kind of matted and dirty vent areas. I have picked each one up and tried to spray the areas with flea and tick spray. This hasn't produced any cleaner behinds. Can or should you give a chicken a dip type bath as you might would give a dog? Could you dip them up past the vent area to clen this area? I haven't noticed any worsm or insect movement in this area....just matted and dirty. Any ideas would be appreciated.