Here is a tip from one of our users:
I found that using the liquid form of Resolve for steam cleaners, just pour it straight on the puddle, like you said, pour a lot of it. Even if I do not use the steam cleaner it works. I let it soak overnight, the smell and stain is gone.
I also found that pepper, regular table pepper, put in a spot that the boys like after I clean it, they smell it once and don't go back to that spot! I feel this is less severe than spraying water on the cat or using the feline away stuff.