Scarey, Scarey.....
Hi Neil
Woodman is correct, too much water and you we be the owner of a new piece of furnishing.
The problem is that the fibre tufts are synthetic with the backing being natural. Your cleaning solution will go straght to the backing as there is no absorbtion on the tufts as they are synthetic. A natural backing will shrink when wet!
The easiest way to identify BW is by looking at the reverse of the carpet. If you can clearly see the pattern on the back then it is a BW. To confirm this do a burn test to check if the tufts are synthetic and the backing is natural.
Also, with a woven carpet the carpet tends to be a lot thicker than a tufted
Of course you can always chuck a bucket of water over it and see what happens! ONLY JOKIN!!
I have cleaned a small number of BW's. if it is well fitted then use as little water as possible, more dry passes than normal and dry as quick as possible with an air mover. So far I haven't had any problems, they come up a treat.
With a rug, not fixed down.... there might be a tad of shrinkage!!
If you want to have a shot at it firstly explian the difficulties with your customer, get them to sign a waiver making sure they understand the problems and take the liability.
hope this helps
Chris