Sounds like an awful problem! I have used Nature's Fresh to get out odors http://www.theherbsplace.com/Natures_Fresh_Enzyme_Spray_with_No-Sprayer_p_829.html
but have never had such a large area problem to deal with. You could use it in a carpet steam cleaner to absorb the smell. What about baking soda? That is supposed to absorb odors also.
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