Thanks for the replies.
There was alot of fairy spilt! Client tried removing with water and scrubing and ended up in a right pickle.
I did not fancy using liquid defoam directly onto the problem. So i just perservered. May try it next time.
Thanks again
Steve
You did not mention they had a go, washing and scrubbing,
It's probably damaged beyond repair, pile would have burst and problem forced through to the backing and underlay.
For future reference, if at a loss what to do you can use salt to neutralise it, it takes a lot but is cheap and effective.