Yes, you can bathe a silkie, just like any other chicken. I use Dawn dish detergent or Baby shampoo and then I blow dry them well and keep them in the house until completely dry or under a brooder lamp for warmth. Silkies are a lot of fuzz and tiny birds under there, so I worry about them chilling quickly. If they are white, keep them clean as possible, (wire is great) as they yellow and it is impossible to get out. There are products you can use on cows and horses to whiten them, a blueing shampoo (it is blue or purple) that will help and stuff like cowboy magic, but it is best to just keep the white feathers white. My fav is the white and maybe the splash, I hope you win blue!