Massive Old Cat Smell in Entire House

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Old lady had @40 Cats for a long time - house is very bad with cat smell probably both feces and urin, soaked into the pine wood floors or this circa 1900 3 bedroom colonial, two story house....When I say very bad I mean really bad...not habitable!@?*

What process or chemicals can be used to combat this - the place is to be made into a rental, with new carpet installed and paint, etc.

Enzyme chemicals, ozone machine, bleech with a garden sprayer.....sealing with kilz?

I am very experienced contractor but don't know how to tackle this one....or should I walk away from the purchase?

Please advise ASAP