I hear you, I go out with the shedding blade twice a day and scrape off as much hair as I can while they eat, and it STILL keeps coming!
I will say if it gets warm enough to bathe again… soak the pony, squirt a glob of baby oil into a bucket of shampoo suds, and scrub with one of those big toothy curry combs before power-rinsing… Made a HUGE mess, but after not being in the barn for three days I got all caught up on shedding.
LOL I remember those days. One of the funniest was cleaning out the ear hair in my Saddlehorses ears. I used an electric clipper. When he put his head up outta reach, the Eiffle Tower looked small. For some strange reason I had and thought of the racing blinders I had and put them on him. Then, I had to sit on the ground to do his ears. His world had turned upside down. What memories we gain. What treasures!