Originally Posted by Tnavas
Thrush stinks like diarrohea dog poo! Sorry to be so discriptive! If it doesn't smell disgusting then it isn't thrush.
Thrush can develop from a range of different bugs and can develop differently in different areas. It's true that thrush is generally stinky, but it's not always very smelly at all, or the same smell.
OP, I'm with the rest of repliers that don't do hoof goop. Here is one link to some research done on different hoof concoctions; The Horse | Hoof Dressings: What Studies Show
Thrush bugs are also anaerobic, meaning they don't like being open to the air, so if there's any risk of thrush, sealing the bugs under a coat of oil can really encourage them.
If you can't get them out of a boggy paddock, at least if you could provide a dry area for them to spend some time daily on would be helpful. Putting pea gravel or course sand down in their hangout areas is great, if that's a possibility.