Getting the pee smell out of a mattress can be tricky. A helpful method is using a mixture of baking soda and vinegar, which can effectively neutralize odors. Sprinkle baking soda generously over the stained area, spray with vinegar, and let it sit until it dries, then vacuum it up. Have you tried any remedies so far? What challenges are you facing with this issue? I'm happy to help you find the best solution!