Brian - While you are looking -- take a look at the "old" ULRICH track cleaning cars.
I had one - HA - 50 years ago - and it worked very nice. It has a felt pad which can be replaced with whatever type of material you want.
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I've used all kinds of track cleaners. The Roco is pretty much a solid pad and will only clean perfectly flat track. Any undulation will cause dirty patches that the pad can't reach.
The best track cleaner I've found is the Woodland Scenic Dust Monkeys. The just clip to the axel of rolling stock and ride along the rail. Before and op session, I apply a drop of rail cleaner to each pad and let it run around the 6 1/2 scale miles of track a couple times then apply another drop. I'll run a couple trains in each direction to get the work done.
replacing the harder ridgid pad with a more flexible one [like a felt pad] will make it a much better cleaner .. have you looked into 'gleaming' the rails yet, ?? it also does make quite a difference
Just opened this thread. The Walther's car looks like it's exactly the same as the Rocco car.
So their replacement pads probably fit.
I am a firm believer in Dust Monkeys. No they are not abrasive like this pad, but for normal maintenance they work well. I have one on all 18 of my cabooses. If you need significant rubbing or cleaning on anything other than refurbished track, then you have other problems.