I’ve never seen a well used fireplace that doesn’t have soot stains surrounding the firebox. Whether you have bricks, stones, tile, or marble; here’s an easy way to remove that mess.
First of all protecting the surrounding area is important, so cover the floor with plastic or a drop cloth. Get a bucket of warm water, a sponge, and a bowl with one cup of trisodium phosphate or TSP. Dip the sponge in warm water, wring out the excess, then dampen the surround.
Add just enough water to the TSP to make a soft paste, and coat the surface of the surround. Let it sit there for 5 or 10 minutes, then use a sponge or stiff bristle brush to scrub it clean.
Once you rinse it all with clean water, your fireplace will be as shiny as Rudolph’s nose!