Q. When I buy a kosher chicken there are sometimes still traces of feathers. Why can’t the chickens be plucked better?
A. If plucked in warm water the feathers would come out more easily, but this would create a kashrut problem.
As there is still blood in the body of the bird before the regulation soaking, salting and rinsing, using warm water for plucking would be like cooking the bird in its blood.