Thing is with the pad, you need to wash them. We did a real stinker of a carpet. Woman used to have dogs carpet 100% wool. Sprayed up the carpet, left to dwell for 10 minutes, then went over with the pad. The dirt that came up. The carpet looked new again. Carpet dog smell went, but all went the pad.
After each clean we do we always wash the pads. In my opinion the pads work much better than the brush.