I just clicked using Firefox and it was ok. Basically he goes over the chemistry of bleach, how it works and how to use it. Calls Vetericyn as dilute bleach.
I had a horse that would get rain rot in hind pasterns, the croup and the groin. I washed him with butadiene scrub, then filled up a spray bottle with dilute bleach, sprayed and allowed the solution to dry on the hair in the white stockings. Since he was a chestnut, in the body I used butadiene solution and let it dry on the body.
Cleared things up.