Physiologically, the absolutely, very best soaking solution for a desiccated plant is pure water.
Adding a lot of stuff to the soaking water actually tends to extract water from the plant in order to dilute the soaking solution - it's an "entropy" thing.
However, I will have to say that the rooting hormones are so strong, that they are quite effective without being an overburdening solute. I also add some soluble trace element mixture (STEM) to the soaking solution if the plant is not overly desiccated.
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