Maybe I had used this cleaning car too much. It went dead. Now I got a new one to replace it. I just tried to overhaul it.
The reason why this cleaning car was dead is one of the hook to hang the pad below the floor was broken. It's a plastic one, so does not survive long :(
Cleaning requid seems to be stored in this parts. Have to check if it works to solder them when I have some time.
The old cleaning car parts are now in a box to be used in the future when some parts are needed to repair the new one.