The poor man, he only wanted to know how to clean it.
My advice would be.
(1) Pre-Test by cleaning Zip End of cushion. You could do a Wet Crock Test
at this point also.
(2) When dry, brush up the pile, then check for softness to touch, colour
transfer and compare this with the rest of the fabric.
(3) If you would like to know anymore about VISCOSE look under RAYON in
the encyclopaedia.
(4) Spend time and go on some good upholstery course such as the NCCA
or IICRC.
YOU SHOULD ALWAYS SPEND AS MUTCH TIME AS POSSIBLE ON TRAINING
COURCES.
You can always meet poeple who are in the same boat as you.
GO FOR IT.
There is also a good FABRIC CLEANING AND CARE MANUAL out there which you can obtain from Chemspec. I would strongly recommend you purchase this as
it has a wealth of information at you fingertips.