While using a turbine vac to agitate pre-spray, does remove a small amount of the moisture, the agitation it provides digs out the soils better than using a roto or a brush, which does not remove anything.
This means that wanding is easier, and soil removal is a higher percent because a certain percent of the original soils is already gone.
I only did one room at a time, not an entire house, so the pre-spray would not be too dry.
My procedure was- dry vac with the turbine vac, apply the pre-spray, agitate in with the turbine vac, then wand clean and extract.
The turbine vac slips on and off the wand cuff easily.
Not dealing with an electric vac then a roto, or brush, meant the entire job went quicker. And more thorough, in my opinion.
Gary