here is my favorite go-to recipe to get rid of any urine smell from carpets & cushions to mattresses. this also removed some stubborn sweat stains from a white mattress that bleach & others so-called “specialty” cleaners couldn’t. it now looks like new.
you need 1 bottle of Hydrogen peroxide, 1 TBS dawn dishwashing liquid and 1 T of baking soda. Mix the ingredients together, spray liberally on the affected area and leave it on until completely dry. Then vacuum the area.