How can I remove human urine smell out of my sofa?
Baking soda! I have five children and have encountered this a time or two or 100 
Get the area wet with warm water and sprinkle a good amount o baking soda on it and let baking soda absorb the liquid. Leave it there or a long time a until dry if possible. Once it is dry vacuum the powder up. If the smell remains try using oxy clean with warm water and let it sit for about 15 minutes then absorb with towel and sprinkle again with the baking soda and let it dry and vacuum it up. Best of luck. If this happens again on couch or mattress, immediately sprinkle with the baking soda it works wonders.
