Or it never streaks. I still don't know what you and Jim Martin are talking about. Are you are running at too high psi? Does it make unremovable swirly lines from the jets? It just doesn't happen to me on thousands of carpets.
According to Mike earlier in this thread, the steaking is not circles, but a straight line.
I actually think I saw this once on a nylon sculptured loop in a family room. I turned down the heat and moved the 360i a little more quickly since I had been moving very slow when I saw it. That seemed to do the trick. Odd for sure. Not what you might expect from a rotary.
One thing I do like about the 360i over the original twin Rotovac is that the swirls seem to brush or rake out pretty well. The smaller tighter circles of the twin head RV often required going over again with a wand to better remove them. Of course the 360i is much easier to use. I don't get as tired.