Ken, I fully understand what you are saying, but if the cushions were tied together on the floor with Velcro then wanded as if you were cleaning a carpet, I personally don't think you would see any noticeable difference, to prevent over wetting the fabric the flow could be adjusted and extra vac strokes to compensate.
I know a lot of people have taken the P out of this question, but in this industry people need to progress and find quicker and more efficient ways of working in order to stay profitable.
I have cleaned the seats and roof lining in Ford Mondeo using a wand and got very good results and saved loads of time.
I noticed someone mentioned curtain cleaning and Im by no means suggesting you do this for a second, but If you had a lounge carpet to clean why not take down the curtains and put the furthest curtain hooks through both casters on the front of the largest sofa. Hold the other end with your foot and wand it just like wanding a carpet, granted this method doesn't look as professional as cleaning them as they hang, but gets the same if not better results not to mention the time saved.
don
