ECOCLEAN XX - This fiber was specially developed for the manufacture of car-wash brushes. Its cross-shaped section has been accentuated in order to improve its ability to hold water. Nevertheless, this fiber is totally non-hygroscopic and this enables it to maintain all its mechanical characteristics even when wet. ECOCLEAN XX is made from PBT which provides exceptional bend recovery, guaranteeing the shape of the brush over a long period of time.