Went to clean 2 sofas today, 1 was dralon - the other I believed to be acrylic.
Started testing and turned out it was viscose. I cut a sample piece off of the spare swatch on the base and showed the client as I sprayed it with cold water. It immediately shrunk and curled up and never regained it's shape.
The sofa was only a year old from John Lewis.
So I narrowly avoided owning a bloody awful patterned sofa !