I haven't used that product, but I used the Mane & Tail Antibacterial Shampoo. I read that you have to scratch off the scabby stuff and let it sit a little to really work. We did that, Honey wasn't really a fan, but we managed. Some of it will bleed just a tiny bit. Then I sprayed the spots with the Mane & Tail Antibacterial Spray once or twice a day. It worked fine and isn't as messy as the MTG. Her rain rot cleared up almost immediately. Before using the shampoo we tried just applying MTG by itself and it didn't seem to do much, I'm sure it works, but you really have to do the shampoo and scraping first. You can also use a betadine solution to wash them, but I didn't want to stain my palomino. It would be cheaper though so I'd use it if my horse were dark. Good luck!
I was normal...then I got a horse.