11 hours, you must be joking, and if your not i hope you charged accordingly, i would of charged 3x over and a bit more for 11 hours of suite cleaning. i'd suggest you try a different approach chemical wise if thats how long a nicoteen soiled dralon took you! Far far too long in my opinion, if it was that bad and in 17 years i've seen the worst imaginable you should of walked unless of course he paid you double what the suite was worth!
For £180.00 i am talking about a standard, not double cushioned 3 seater and 2 armchairs, cleaned in whatever the appropriate manner may be for whatever the circumstance, the turbo dryer would be in the room also, including chat tea and biscuits, a very civilised 3 hours start to finish, no rush no drama, NO SWET, a quality service, a quality clean with accelerated drying time, extra for guarding etc. and a happy repeat customer and probably a recommend or 2 chucked in.
regards