I know this is strange question but may be someone with white silkies or white birds can understand my problem. I have a pair of white coturnix quails. They were little dirty when I brought them and now they become Greyish. They are healthy and breeding as well. I don't like when people think them as grey chickens, I mean they don't look like quails anymore (ugh). I have washed them with little bit of water (in summer) but I cant get their color back. Can anyone suggest what should I use to wash and clean their dirty feathers so it can get back in original color?