How can I effectively remove the cat urine smell out of my mattress?

To effectively remove cat urine smell from your mattress, start by blotting up as much urine as possible with paper towels. Then, mix equal parts water and white vinegar in a spray bottle and spray the affected area. Let it sit for 5-10 minutes before blotting it up with a clean cloth. Next, sprinkle baking soda over the area and let it sit for a few hours to absorb any remaining odor. Vacuum up the baking soda and repeat the process if necessary.