Yesterday we did a test between a CRB with blue brushes vs a 175 with green stripe pad. This morning they look similar. The rug is a gray 8x10 shag with ton dog oil and appears to be some wear. It is really humid here in Va and its dry to touch but moisture meter is picking g up moisture so we added some extra fans just now. Plan on doing a white towel swipe test this am to see if its wear or oil as it looks ton better but appeared to be worn. We used Black Label and I did shoot a live video while Ed was cleaning it. I'll take additional b4 and after pics and add it to the video as we progress then put it on Youtube then here. Watch for the video. However ATM I don't see much of a difference between a CRB and 175. I plan on doing same test over multiple tests, soil conditions and fiber types. I'm fortunate to have a rug spa where we can do lots tests. Any further suggestions?