Here is another video showing another company agitating the carpet. However with that type of machine and brush you are not picking up the smaller soil pieces. We use a different machine while agitating that picks up all the smaller soil pieces and the soil in the secondary backing of the carpet allowing us to get a very deep clean. The stains won't come back because we remove all the soil. Please give us a call when you need your carpets cleaned or tile cleaned. Look forward to your call.