How to get pee smell out of mattress

Okay so explain the pee smell.. my so peed the bed. Please don’t shame him for that. It’s the first time in our 6 year relationship that it’s ever happened, hasn’t happened since. I have done it too before when I was 22. It just happens sometimes. I’m sure there’s an underlying factor that causes it like stress or something.

I’ve tried baking soda, white vinegar, I’ve scrubbed and scrubbed it and I can’t get the pee smell out.