My Taxi said the bread thing, but I fear the crumbs. Been using a brush attachment on the vac and occasionally a tissue.
My taxi also said to use your finger and thumb and lightly pinch and gently pull the feather ends that are "Freyed" to get them back into shape. Specifically the tail feathers. He said the oil in your hands would be plenty and so far he has been correct on that. He also said the oil in the bread would be good for the feathers.
Just been curious what the best method is tha you all do.