CAT LADY - help me get rid of the odor!

[Kyle Grimm]

I have a home that was infested with cats. The second you walk in, the smell punches you in the face. The floor has been stripped down to sub-floor and the sub-floor must still be holding odor along with walls, ceilings, and everything else in the house. Has anyone had luck with spraying down the entire house or have any tricks/tips on ridding the smell without replacing the sub-floor, drywall, etc? Thanks!