That is what preen means. Someone with another career might not even recognize the word. But now that she thought about it, it did make sense. Birds did it, and her wings were rather birdlike. It was wrong to expect them to just stay together perfectly and need no maintenance. Half of the special soaps and waxes that Lightning Dust kept around her bath were wing-related. Where everything else they had was the cheapest that money could buy, she spared nothing on her wings.