Scott's posted good info.
Probably this begs the question of what type or smoke residue?
Nicotine? If soot residue from a house fire, what burnt?
If you've had a lot of plastics burning, and then have synthetic foam and fibres on the fabric, you may have buckleys chance at 100% restoration.
Firstly thopugh removal is the key as Scott said. Dry vac what can be. Start with approved detergetns but if it's bad, you may want to progress to something like Prochem UltraPac Renovate which I'm a big user of and have had reasonably good success with.
Also consider replacing foam on removalbe parts like cushions. For the frames, you can remove the ticking fabric below and saturation spray the faom and timber framing.
Also having a air tight chamber to fog, ozone and whatever in is a bonus.
Deodourising should be a last option NOT the primary option instead of cleaning.
For deodourising, I use a range of products and types. I use a range of thermal fogging with both water based and solvent based products. I also use ozone and a lot of products from the likes of Unsmoke, Vapor Tech etc.
With dedicated odour removal, sometimes it takes more than one go and more than one type, even then, there will be thte odd job you won't win.
John
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