Ok, don't laugh, but I have been using listerine sprayed into the hooves this season if I see the beginning of thrush. I wasn't sure if it would be effective, but I had some in my grooming box and decided to try it. Crazy as it sounds, it has been highly effective. I would not have believed it if I hadn't tried it myself.
My spray bottle has 50/50 water to the brown original listerine. Super cheap, doesn't stain or smell funky. (Though I do happen to like the smell of Koportox, but I'm just weird like that).