We have a first-time heifer with a nice healthy calf but it's been 3 days and she has not dropped her placenta. It's starting to get an odor (of course it's 90 degrees outside) I'm reading that you shouldn't clean it out? It will take care of itself - just get what you can and clean the area? What is the general consensus here. We have her in the corral and can get her in the chute. LA200 for preventive maintenance?