How do I remove a cat urine odor from hardwood floors?

This my be the wrong venue to get an answer but I thought to try it.We have cat urine odor and some stain removal in an area of hardwood flooring due to 2 cat urine accidents. I have tried several coats of Nature's Miracle and 2 coats of Urine Off (Veterinarian strength) and after all of that, I mixed water and vinegar and with a steamer sponge mop. The area odor minimizes for a while but the next day, it seems the odor returns. Our cat box is kept clean outside and inside so I am desperate to find any other solutions that may work. Thank you so much! Pam

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