Urine be Gone?

We have recently moved into a house that the previous owners were elderly and their dogs were not house broken.  I need to find and eliminate all traces of accidents of that my dog will successfuly become house broken.
 
Has anyone ever used the "Urine Be Gone"?   I think it was on tv also.   I clams that it removes all enzymes and it comes with a black light to find and then eliminate all of the stain.  I found it in my magazines and if it works, I was going to order some. 
 
Of if any one knows of a brand that works well, please let me know.
 
Thanks!