I didnt do it-I got a brush and then just rubbed them with a cloth- he is out in pasture every day all day until 4-5 pm so he gets into the muck-the hoof pic brush did pretty well then I picked off what it didnt remove with good old fingernails. The person who suggested it is a show person and she knows we are showing next sat.
My barefoot trimmer sands the hooves right before she is finished. She says that it (obviously) smoothes them some and also (not-so-obviously) stimulates new growth. I just kind of nodded my head and said OK. She doesn't sand the hoof really well, she just holds the ends of the sandpaper cloth and gives it a all over scuffing. *think shoe shine*
Be strong and courageous, and do the work. Don't be afraid or discouraged by the size of the task, for the Lord God, my God, is with you. He will not fail you or forsake you.