Matthew Mackay-Smith has recommended drying them out.
I've used a combination -- but ended up treating as I would my own chapped
hands.
Moisten with something not too greasy -- lots of aloe -- so that the horse
can work comfortably.
Straigh Arrow's Hoof Maker (since it's such great hand cream) has worked,
but it can sting open sores.
Unless there were a rampant fly problem or a valid reason for wrapping, I'd
think that might prolong the problem.
Good luck!!!