If your couch smells bad, there are a few things you can do to try and remove the odor. First, vacuum the couch thoroughly to remove any dirt, dust or debris that may be causing the smell. If there are any visible stains on the couch, treat them with a stain remover or upholstery cleaner before vacuuming. You can also try sprinkling baking soda on the couch and letting it sit for a few hours before vacuuming it up. Another option is to mix together equal parts white vinegar and water in a spray bottle and misting the couch with it. Let the vinegar solution dry completely before using the couch again.