With the many applications of silver nitrate in the world today, it is no wonder people have stains of this substance on hard surfaces. Silver nitrate is a difficult stain to remove; often, it is permanent. Numerous household cleaners and scrubbing do not remove these stains. Harsh chemicals are often implemented as a last resort to try and clean up silver nitrate spills. So unless you intend to cover up the spill with paint or another form of covering, ammonia has proven to be one of the best cleaners when it comes to silver nitrate.
Put on the gloves. Pour a small amount of cleaning solution on top of the stain on your counter.
Scrub thoroughly with the steel wool.
Add more cleaning solution as needed and continue scrubbing until the stain is removed.
Ammonia is lethal if ingested. Call poison control immediately if ingested. Do not make skin contact to avoid chemical burns and allergic reactions. Have as much ventilation as you possible while you use it.