Test for bleeding. If it is stable then you can encapsulate it with brushes suitable for wool. You can extract with a pre-spray around 8 and an acid rinse. You can pick up and send to the local rug washer. The customer can choose between good, better and best cleaning at different price points.
At a rug class several years ago we thoroughly pit-washed one of my favorite rugs. I loved the cleaning. However, when I put the rug back, I did not mention to my family. No one commented on how clean the rug looked compared to previous encapsulation cleanings. We need to remember that some of our customers just want it cleaned and do not notice the difference between good, better or best cleanings.