We spent a year getting a horse to heal after prior owner cut off proud flesh. We tried all kinds of things, what worked best, and is what our vet uses on almost wounds is saline water…we would make up a batch in tupperware and keep wound pads in the container, after cleaning we would apply a new saline pad and wrap. What we learned the hard way was most of the proud flesh treatments are too harsh and prevent healthy tissue from growing.
Once we get past the proud flesh stage we used a product called steel aide - I was impressed with how well the wound started healing with that. You can find steel aide on facebook -