caked on dry mud

I tend to wash off when wet, but if it hasnt been for what ever reason i put effol hoof oil on, leave on for a bit then scrap off or brush off. Can be usefull if you dont want to wash or its to cold to wash off.
 
Bit of both; hoof pick with a brush is helpful. My boy had very muddy legs the other day and I felt guilty not having time to clean him up properly before lesson, but an hour in the arena (shredded rubber surface) and he was spotless:p
 
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