It is obvious that there has been ZERO consideration given to the importance of a proper wand stroke, and it's importance in regards to efficient recovery.
With each forward keyed stroke, the forward wand is not immediately recovering solution, and with every back keyed stroke, the rear wand does not immediately recover solution.
With so much distance between each wand head, too much time between spraying and extraction will only lead to over penetration.
Only a very disciplined, LONG wand stroke pattern incorporating efficient dry strokes would remedy this given it's poor design, and would be difficult on anything but large open areas.
I wonder if his very fast wanding is a poor attempt to compensate for this as he may be aware of this recovery issue, but it looks to me as if it is only leading to poorer recovery, as too many areas are being missed and inefficiently extracted with such an erratic wanding pattern.
Heavy soiling conditions requiring a SLOW stroke would be even more of a challenge.
If this guy was on MB, this never would have happened.
Love the porn tunes tho.