i think one of my chicks is starting to develop a pasty vent, though it does not cover the vent, it covers the place where his umbilical cord should be (they are 2 weeks old so that should not still be attached to them), should i clean them? and how? i saw a few methods, but im not sure whichever should i use. I was also scared of accidentally taking his scab of the umbilical cord, but that should have already fallen.