Need advice on pet urine odor

[Ryan Standage]

I'm looking for some help on getting rid of urine odor in a two story town home.  I did a search but it seems there are so many opinions out there and I was hoping to get some info from some landlords who have some experience with the issue.  My inherited tenant moved out recently and the unit reeks with urine.  They had several kids and one dog. I'm nost sure if the urine is human or dog.  It hits you like a brick wall when you walk in the front door.  I've identified the problem area to be in one of the kids bedrooms.  All the carpet and padding has been removed.  I am currently replacing the wood sub floor in the problem bedroom.  The smell is getting better but I can still sense it.  I can't put down a new floor until it passes the smell test.  Ill be going in tomorrow night with a black light looking for problem areas.  My questions are:

1) What is the best odor neutralizing product out there?  I've read to use white vinegar, hydrogen peroxide, nature's miracle, odorxit, bleach solution, etc the list goes on and on making my head spin.  

2) Kilz original oil based primer VS Zissner BIN shellac?  which is superior for sealing urine odor?  The BIN is about 3x more expensive but it if seals the urine better I'll gladly pay the extra cost.

3) Should I spray the primer on the lower level concrete floor also or does concrete not soak up the urine?

I may have some more questions as the job progresses.  Thanks in advance.