Is there a way to get urine smell out of hardwood floors?

Calvin has stopped spraying in almost every place. In just the past day or so, he has taken to spraying at the door going in to the garage again. As far as places go for him to spray, I am not too upset with this. I would like to curb all the spraying, however. 

Does anyone know if there is a good way to ensure the smell does not stay in the hardwood floors by the door? I am going to probably paint the door this week to try and help the smell there, but wasn't sure what to do for the base of it near the floor. 

I am cleaning with Nature's Miracle whenever I see/smell he has sprayed, but I want to make certain that I'm not missing anything. 

Baking soda- leave it around the area for several hours. helps best if the area's still a bit wet from the urine.

it helped me when Monet urinated on my floor when I moved here