cleaned a customers house carpet this morning.Its a beige one, and she says 80/20 wool.Bought two years ago, never cleaned, she has a little dog that hangs out in the room but doesnt go to the jacks on the carpet.Anyway, I cleaned it in the normal 4 step fashion,using prespray gold, citrus gel on the spots , and it looked awful. it was like there was these black areas that were matted into the carpet. Fortunatly I had the rotary with me, so I bonnet mopped it using traffic lane and more spot removal, and then extracted. Still looked OKish, but not fantastic. Have got better results from pub carpets, any ideas why this carpet was so hard to clean?just a curiosity.Do you think it was the dog hairs? if is on a concrete floor, would dust through the backing cause it?