Moinsen, I have a Kärcher FC3 and it gets on my nerves that i can't dry the cleaning rolls after I cleaned them in the sink. Because the microfiber keeps so much water and it smells before its drys. So i adapted an Idea for cleaning Painter rolls. Designed the tenons from the device, tap them with M6, put a m6 threaded rod in the adapter and counter them with a nut. Now the easy part. Put it in a drill and give it a second at full speed in the sink and done. Nearly dry, the fiber is perpendicular and can release the rest of the moisture to the air easily. No more smell anymore, because they are absolutely dry after a few hours.
As always feel free to ask in German oder English.