I know what you're saying Mark, but how then do you explain that back seats, fitted with MB Tex, are not nearly as prone to this deterioration as the leather seats ? Furthermore, the same applies to velour - it does not attract the same problem.
Also, earlier models, such as the 109, were also free of that problem. Finnies even better again. No, I reckon there was some sort of a quality problem in some way. Regards. Styria