I am currently spraying it with Enzymes and then plan to pour as much Kilz in this spot as I can. 

There are also quite a few enzyme products out there, but working in an abrasive mix of TSP should help a lot.  

If it's concrete they make an enzyme that will kill the ammonia in the urine.

maybe enzymes, or some of the systems for failing systems that are out there? 

I've also been told with today's cleaners and enzymes it's pretty easy to get rid of the smell.I wish the forums had a voting option, but I wanted to start up a vote to see what the general consensus is..

To clean the floor  we used 3 stages of chemical treatment and enzyme treatment .

@Maritza McKinney when u turn over prepare to get rid of all the carpets, enzyme treat and the.

I'm hoping the sealant works well but figure once I do that, it can't be treated with this enzyme product at that point. 

I started doing a regular routine of enzyme treatments every few months I use either Ridex or the enzyme sticks by Green Gobbler down each sink and shower every month or so and no problems since. 

To clean it, you would need an enzyme cleaner and it must be liquid, to pass into the concrete itself.