OP: I do have other cleaning solutions, including an LGB Cleaning Block that rides in the middle of a car I created by cutting up a short LGB car. It is basically a rough version of what is shown above.
I was just curious about this recent find on an eBay purchase, as I had never seen such a thing. With the small wheel rotating around as it slides along the track, it seems like a neat option. But, parts and replacement pads are not available. So there’s that.
I also have the short LGB flat car with the two cleaning pads mounted underneath. I think that is my least favorite option as it requires weight to stay on the track and is difficult to pull.
I would really like to get all three of these options working and just pull them behind a couple of engines. Then, one pass cleans 3 times.