Iodine!! When we first got my miniature horse she was horribly obese, and had severe thrush in all four hooves. I would go out once or sometimes twice a day, pick out her hooves and spray iodine on them... But I have been told it can sting the coronet bands so be carefull it doesn't go over them.
When I sprayed it on I would stand her on a concrete yard and then spray them, then wait for a few minutes. It was literally gone within a few days.
To those saying apple cidar vinegar... I haven't heard of that one but I know it definitely cures Grass staggers to those that know what staggers is.
R.I.P ~ Bubbles - 25yo tb mare - 13.04.2011 ~ 8:30am ~ passed away naturally and peacefully in my arms