Cleaning up a soot-stained fireplace can be a daunting job. There are commercial cleaners available, but they can be kind of harsh. Why not try a safer, cheaper route first?
All you need to make your own effective cleaner is a few tablespoons of cream of tartar with enough water to make a paste. Apply it to the stained areas, let sit for 10 minutes, and rinse it off with warm water. Hit up the full article to check out other natural cleaning methods, as well.
How To Clean a Brick Fireplace with All-Natural Cleaners [Apartment Therapy]