The recommended cleaning method for wool and specialty rugs , is washing them. For as long as rugs have been woven, they have also been washed. But before the washing even begins the dusting needs to be done. Rugs – especially wool rugs- have a capacity to hold a large amount of soil in them. A wool rug can hold pounds of soil in it and still not look especially dirty. The dirt is hiding, and not just dirt and soil, but a whole host of contaminants. There are several reasons why cleaning rugs requires them to be removed from the home. The big one of course the removal of this soil before cleaning, and then the actual washing of the rug itself, which simply cannot be done with standard carpet cleaning machines ( portable or truckmount ) Those are considered surface cleaning not washing.