Thanks for all the info guys, but this job needs to be done in 2 days tops - 10 rooms, carpets, curtains, upholstery, beds, mattresses, even the lamp shades! oh, and a huge corridor - no time for 24 hrs / room with an ozone generator.
So I guess it is down to HWE with deodorisers in the tank! I have pre-warned them that some heavily padded items like mattresses and bed bases may not be completely odour free, and they are happy with that.
Think I might try Kill Odour Plus from Chemspec, as it is Woolsafe and I can use it in woolsafe jobs in future. If anything else is better, let me know!!!
Cheers