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BTW, I'd put bleach in the steam water.
Edit: Also, I would not go overboard removing old wood. If you can put insulation styrofoam on top of it and cheap paneling over that, what more would you need.
If it were I, I'd remove all of the poop that I could and throw it on a large brush pile fire out in the yard, making sure that it all burned.
Then I'd rent a steamer that would put out lots of red-hot steam and use it throughout the coop.