Tom, read that thread completely about the do it yourself RI treatment. You and only you can make a determination as to wht you feel is good for your snake.
I personally would take my snake to a vet for a culture to figure out exactly what it is the snake actually has so it cn be treated correctly. I personally wouldn't use f10 or any of the like due to chemical in it that could be harmful to the animal. One should really read bottles well, and heed their warnings when they are present. I also wouldn't use vicks or any eucalyptus anything around reptiles, as I have read it is an irritant to them, and being they cant tell you that wht you may have used to treat them is doing damage, I would avoid them all together.
It makes no sense to me to let the animal suffer longer than necessary while one plays science project whom isn't really qualified to do so.
Take your snake to a vet, have a culture done. that is the answer to your issues.