1- 75% of it is genetics. Your calf either has it or not.
2- if your hair is really stiff and untrained you can revive it and brush against the grain daily to break it at the root. Brushing also stimulates growth.
3- Roto brush- it will cut your time in half. We use Olive Oil which is for ethnic hair and coat the leg. Work the leg with the roto brush.
4- Keep the legs clean. Daily rinsing will help. As the weather warms you need to make sure you keep your animal cool.