Very interesting option.
I'll take a crack at translating the german text from the KPF page here (as there is no UBB code for creating a table, just the translation):
Rail CleaningMany manufacturers call them rail cleaning cars.
Us too.
But we follow through on what others promise.
Not even the center conductor is cleaned? With us it’s not only cleaned but treated.
For us and for you it’s not just a simple cleaning car. It’s a system similar to a constructor set.
Did you look at the price? There are manufacturers that offer a €200 cleaning car. Cleaning cars that cannot possibly work well do to their physical characteristics. With integrated vacuum power under 1 Watt.
The market for hand-vacuums have some up to 300 Watts and those frequently function only marginally. Home vacuums of 1,000 Watts generate enough suction to achieve proper cleaning potential.
We classify such providers as “blinders”, and we stand by that statement, as we don’t blind. Test our methods of cleaning. We play with Swabian fair cards.
Money back if not satisfied is given with us. You would be the first.
If you buy/sell on eBay, you understand how good your product and customer service needs to be to maintain a 100% positive rating.
We have 100% positive rating.
The renowned magazine, “Modelbahntechnik aktuel” [Model train technology today] has tested our rail cleaning system in H0. You can read their test report
HERE
You select how and
with what you clean your rails based on the condition of the rails. You assemble a cleaning train, which then travels over your routes.
Wet cleaning, dry cleaning, the removal from surface dust rust to conservation. Not everything at once – but via various entities all
within one train (consist), which is selected and assembled by you for the deployment need.

Not from the rack/peg – you assemble the individual professional cleaning solution.
Even the coating with current conducting oil is possible, so that the surfaces of your rails are protected against corrosion.
And all of this with a sensational result:
We are not manufacturing nonsense, we follow through where others promise.
Looking at the attachments for the weighted cars (1 for rails, 1 for center conductor) they have differing shoes to deploy: fleece pad for dry cleaning, SWR (Specific Wear Rate) 1000 pads for removing surface rust, SWR-240 pads for smoothing track joints, wet cleaning.
The cleaning shoes are out of poly-carbonate with an integrated stainless steel weight.
The rail cleaning car is typically the 1st car in the cleaning consist, comes with 40 dry cleaning fleece pads which is well suited for the initial removal of house dust and oil contamination on rail surfaces. The CC-Z conductive oil that can be deployed for treating cleaned rails and shields from rust and dirt accumulation.
Looks interesting. Will love to hear experiences with the system..