Hi Daves,
I posted the other day that I cleaned a trashed wool carpet in a pub, sprayed with citrus prespray, Nemesis and enzyme all in different areas then extracted with Double Clean.
Owner was really happy.
Sometimes you have just got to clean that carpet
On a trashed domestic wool carpet I would not use enzyme and I would spray with concentrated acid rinse at the end.It's also important to do a colour bleed test to see what you are dealing with.
By the way Nemsesis seemed to work as well as enzyme on this limited trial and citrus prespray was also effective.
Cheers
Doug