Oldhorselady - it may work but it is painful for the horse and by picking off the scabs you risk introducing bacteria.
The Nizerol works very fast because of the ketaconisol in it. I've been doing a lot of research into these conditions because it is a big problem here.
Traditional treatment leaves horses with mudfever lame with swollen legs and distressed with the treatment - those horses that are treated with Nizoral recover very fast with no lameness or swelling and do not require any antibiotic treatment.
Because we are in a humid area we get a lot of problems with rain rot, mudfever and greasy heel so get a lot of experience dealing with it.
I have been in toouch with vets in UK, NZ and Australia all these vets are now recommending Nizoral for the treatment.
My studies ahve been done on my own horses and on the race horses that I used to look after - we generally had more than 100 horse in training at any one time so got to study many.