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To remove odor from a leather couch, let's focus first on what not to do.

A quick Google search may suggest using vinegar to do the job—don't. The acid will dry out anything made of leather. A better DIY option is to sprinkle a little baking soda on your sofa and let it rest for a few hours. Afterward, vacuum it up with a soft-attachment brush. You can also try airing your sofa by opening windows or leaving it outside for a few hours in a clean, dry space.

With a thorough cleaning, the smell of pet pee may dissipate within about 15 minutes, although in many cases, it may take several days to stop smelling after cleaning up the stain. If you leave a urine spot untreated, it may take up to five years to stop smelling on its own.

Vinegar and baking soda can effectively remove old carpet stains, and there are a few common methods for application. One method involves applying them separately: sprinkle baking soda over the stain, let it sit for 15 to 30 minutes, then vacuum it up. Afterward, blot the area with a solution of equal parts white vinegar and water. Another method combines the ingredients on the stain to create a foaming reaction that helps lift it. To do this, pour a generous layer of dry baking soda over the stain. Then, in a spray bottle, mix distilled white vinegar with warm water and a few drops of dish soap, and spray this solution over the baking soda. Let the mixture sit for several hours until dry, then wipe or vacuum up the residue and blot the area with a clean towel. You can repeat the process if the stain persists.

Use similar methods to get old stains out of couches as you would new ones. Determine the appropriate cleaning solution based on the tag. However, you may need to let the cleaner sit longer than you would with a new stain or make several passes at the stain. Contact a professional upholstery cleaner for guidance if the stain does not budge.