Some years ago I used an Enjo brand cloth that was claimed to do a similar job and it scratched the first panel I used it on so badly it needed to be cut to remove the marks.
I am wary of unbranded cloths like this from EBay and will stay with what I know works safely.
The day Swissvax releases a clay cloth is the day I will be happy to use one.
By the way, if you use such a cloth at each wash Michel, aren't you simply removing all the existing wax and therefore necessitating a fresh application with each wash?
Regards,
Brian
Not all my cars are waxed Brian
This was meant for the vehicles that stay outside and are not 'babied'.