What to do with cat infested Homes!

[Marc M.]

I have rehabed and sold over 100 homes in the Massachusetts area, I just picked up one of the worst houses I have came by and it was infested with over 200 cats. There is not an option to knock it down and build a new one, I plan on ripping everything out but I’m not sure if the cat urine went behind plywood or anywhere else other than what I can see. Anyone have any tips or any commercial spray or anything that could help!? Do not want a lawsuit! Thanks in advance!