Hi! I am just finishing up my enclosed outside run and have a ton of those prickly weeds in one corner. I've mowed them down several times and they keep coming back. My babies were out and kept stepping on them then trying to pull the sticklers out of their feet. Any suggestions on how to get rid of them? And can this cause any serious issues with the chikens feet? I remember reading someone saying vinegar kills weeds-any expereince with this? Would bleach or soap work?