My disabled duck Regie has wing feathers growing so fast, but the " white coating stuff" is not coming off and one wing has the feathers sticking out. One side is ok, but she cant seem to preen herself properly on the side of her bad leg. I have been trying to pick it off, and giving her extra time in the bath to try to soften it for her. Does anyone have any other suggestions on how to help her or should I just continue picking the stuff off her wing feathers.