Hi,
I would contact prochem and see if their Microsan kills it. It contains a broad scale virucidal agent that i think will. Most viri operate by the same mechanism, so i would expect it to.
Vac, prespray with Microsan, Agi, Extract with crystal green (important as it doesnt take out the microsan), collect money. Purists prolly hate me for it but it will get the job done. Desperate people pay decent on a good pitch.
Hope this helps
Graeme
Access Cleaning Solutions
PS If its manky i would let the microsan dwell for 10 then prespray CG out of the wand hot before agitation. Again purists dont hate me i just get it done.