Hi! I was wondering what you were soaking with?  Idoine is great at killing fungus/bacteria but it is also great at killing live tissue. If it is true whiteline than the hoof wall will most likely sound hollow when you tap on it. The wall and laminae are extremely compromised due to the infection so weight bearing in that area is not benificial. Relieve the wall, kill the bacteria/fungus with soaking with vinegar or white lightning (I found that these work the best because they allow for the hoof to heal withut killing live tissue) and you could even use a boot so the gap is kept clean. I trimmed a mule that had it bad in a rear foot for over a year so we did the above(boot and all) for a month or more and slowly but surely a good connection grew in. Depending how far the infection goes up into the whiteline. If not far then in maybe 2-3 trims. Other wise you are probably looking at a couple of months or more. Is there any infection in the frogs? Oh, they must be kept dry or the infection will multiply like crazy!

Hope I was helpful and good luck!  -Rachel