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I agree with all the suggestions on cleaning and isolating. You may also consider getting those other young ones out and integrate them later. 6 week old pullets should not be in with full grown hens.Another thing, placing small pullets with large adult hens is setting them up to be attacked and possibly killed. They shouldn't be with larger chickens until they are of substantial size to be able to protect themselves. And, even then, you will have to integrate them into the flock properly.
You need to pick the dirt out with tweezers I think.I did flush it, nothing came out.