Cat urine, carpet and a very rusty floor

I did not know until after I bought my vette, it was a mice motel.
After scrapping the carpet seats etc, painting the floor with POR 15.
You can still smell it years later, when it gets hot out.
The wife and I actually took it to breakfast today, and she commented that you cannot smell the mice until it starts getting warm outside.
I don't think the smell will ever come out of that car, and I gutted the inside, and replaced the interior.