“how to remove urine smell from mattress +neutralize cat urine smell”

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A: According to Coit, damp smells can be removed from clothing by machine washing the items with ? cup of vinegar and ? cup of baking soda. Placing damp-smelling clothing in the freezer for two hours also helps to eliminate odors. Musty smells emitting from the washing machine can be treated by pouring ? cup of pine-scented cleaner into the machine and running it on a full cycle.
The smell will usually lead you directly to the area where your cat has urinated, though you might have to feel around with your hands for a wet spot if it is on carpet or cloth-covered furniture, or a sticky spot if it has dried on tile, linoleum or hardwood floors.[2]
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Use air fresheners and get the floor professionally cleaned. You might need to set up recurring floor cleanings to get the smell completely out. Worst case scenario, you will have to replace the flooring and anything else the cats peed on.
I have good cats but I rescued one who proceeded to mark a room where the previous owners cat smell was. I tried all I could to re-train her, get rid of the smell but it just got worse & worse. She’s been re-homed.
Remember to always do a spot removal test on a portion of carpet or upholstery that is normally not visible. These are suggested treatments only and COIT can’t be held accountable for any damage sustained by use of the treatments in this spot removal guide.
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“Clean up pet accidents by first blotting up the area and then adding a white distilled vinegar-and-water solution. Blot until it is almost dry. Then sprinkle baking soda over the area and let it dry. Vacuum up the residue the next day.”
Enzymes are created by bacteria to digest proteins found in urine. These bacteria (sometimes called ‘bugs’) are living organisms that essentially “eat’” uric acid crystals. The affected area must be hospitable to the bacteria in order for them to work — moist, not too hot  and must not come in contact with chemicals that kill bacteria. Hydrogen peroxide breaks down the proteins and microorganisms found in urine through oxidization to quickly address short-term and long-term smells. Our formula also includes surfactants and an acidic pH, which effectively removes urine stains.
Try different litters. Your cat may not like the texture of your current litter, so find out what he does like. Line up a few disposable litter boxes next to your cat’s regular box, each with a different brand and/or texture of litter, and see which one your cat likes best.
For carpet, mattresses and upholstery stains: Blot with a dry clean cloth or towel absorb excess liquid. Spray directly onto stain until completely covered. Allow to stand for 3 minutes. Blot area with a clean damp cloth. Repeated applications may be necessary for heavy or old stains. Keep children and pets from contact with sprayed area until dry. Safe for all colorfast upholstery, fabrics and carpets, including stain-resistant carpeting. Do not use on silk or leather upholstery. 
I would personally not use the wood pen. If it was the source of the odor, you’d probably know pretty quick by giving it a sniff. Even if it’s not, any scent that sinks into will encourage him to go there again. I recommend a commercial puppy pen (plastic or metal) or the use of a kennel/crate-at least until he’s learned he can’t potty everywhere. Much easier to clean as well. I don’t know how old he is, but if he’s quite young, he truly cannot physically control it past a certain point, so if you have to leave for long periods during the day I place a blanket or towel on one side of the pen and a potty pad on the other so they can differentiate where they potty from where they hang out. I know-people say if the area is small enough they won’t go potty where they sleep. This is not true. Plenty will, and then they traipse in it! So potty pads come in handy for keeping them out of the mess and tracking it around as well.