The Collaborative International Dictionary of English v.0.48:
nonwashable \nonwashable\ adj. not washable; damaged by washing; -- used mostly of clothing, especially clothing that must be cleaned by a dry-cleaning process. Opposite of washable. [WordNet 1.5]WordNet (r) 3.0 (2006):
nonwashable adj 1: not washable [ant: washable]