except for the poopy feathers like was posted above!I researched.... it turns out when not in use both tracts end before the opening. Whenever you butcher a chicken... there is clearly only one hole.... and everything ends in a little pouch area before the exit.
However, when laying an egg the oviduct extends out of that hole, keeping the egg from touching any of the poopy cloaca area.
So you are correct in that the egg doesn't touch anything.