Grab your vacuum cleaner—the one with the hose attachment that you never use. Vacuum up all that baking soda. You’ll see it disappear, along with the smell. Give it a sniff test. Does it smell clean? If you still get a faint hint of “oops,” repeat the vinegar spray and baking soda step.
If you’re dealing with a really stubborn old stain, try adding a few drops of lemon essential oil to your vinegar spray. Lemon is like a little sunshine bomb for smells. Your couch will thank you.