Could possibly work...
I was just thinking that maybe if they had enough dirt in there they could do a dust bath and that would dry it up and help it to kind-of come off by itself.
I've got the same issue with my one week old JGs and their barnyard mix broodmates. I'm thinking I'll try an old soft toothbrush on them. Because I don't want to chill them with a bath and make them hate me, and I'm too cheap to buy baby wipes.
