I have up close and personal experience with urine odor, its inconvenient but can be completely mitigated:)
First remove everything soft like carpet pad sofa etc. Just discard all of it its not worth messing with.
Scrub down everything! with your favorite detergent, it wouldnt get rid of the smell:( but it will help with what comes next:) DRY THOROUGHLY!! Primer and outdoor poly stick better to clean surfaces:)
SEAL FLOORS with OUTDOOR POLYURETHANE, give everything at least 2 coats. You can use this on paneled wall too. Then prime all painted surfaces with bin or kilz OIL BASE PRIMER, 2 coats then paint everything normally.
The key is outdoor polyurethane so moist weather doesnt soften sealed surfacesand bring the odor back!
This is what fire restoration companies do and it WORKS. You can use outdoor polyurethane on concrete floors too
I flipped a urine soaked home. IT STANKED>
When I was done the odor never reappeared:) the buyer had a clause in the sales agreement that I was on the hook for future odor troubles. they had no troubles.
I applaude you for buyinmg a home you can afford! Too many americans bought way too expensive homes and helped crash our economy:(