If you have access to warm water, hook a hose to the bottom of the hot water tank in the house and attach a blender or a Y. Warm water works quick. Baby oil, maine and tail and pink oil will soft and release. Soaking the animals also helps. Sometimes if you leave it on all winter, the hair may come out with it. Get to rinsing ASAP to keep hair growing. Most likely you will start to see the calves shed out in a few more weeks. Get a grill block and work it til its almost nothing. it will pull the dead hair out.
We have rinsed all winter and pick the stalls on daily/every couple day basis. it makes clean up or keeping them clean easier.