A:
That is a tough question. I guess you would have to inspect first for embedded soil, then use the unit and see if it was gone. I have not done this, but my water was fairly dirty after cleaning, and the carpet is vacuumed every two weeks, so I assume at least some of this dirt was imbedded. In any case, my carpet is cleaner than it was before and I am happy with it. I looked at a website that rated cleaners before I bought and this one was rated the best.