Ventilate the area by opening windows and turning on fans, since ammonia is highly toxic in enclosed spaces.
Empty the silver salt shaker and place it in a bowl or container.
Pour enough ammonia into the bowl or container to completely cover the salt shaker. Cover the bowl or container with plastic wrap. Allow the salt shaker to soak in the ammonia for at least 10 minutes.
Remove the plastic wrap and check the salt shaker. If corrosion remains, soak the shaker in 10-minute increments until the corrosion is no longer visible.
Use a silver polishing cloth to polish the silver. Store the salt shaker in a cool, dry cabinet.