Bill, this in no way can be used to scrub anything. It is a driveway sweeper - not a scrubber. It would not even fit in a house. These are as big as a lawnmower.
If you want a scrubber to work cleaners into the carpet, you would need a orbital buffer with pads or a vintage scrubber shampooer.
The Oreck Orbiter is a good scrubber cleaner.
