Cleaning the face of a fireplace is a project that demands patience. Fireplace stone and brick may be hard, but they're also spongy. This means it has plenty of tiny holes for soil to build up in.
2. Mix a solution of high-alkaline cleaner and one ounce of chlorine bleach per gallon of warm water.
3. Wet the surface of the fireplace well with the solution
Do not use so much that it runs. Dirty water running down the face may cause hard-to-remove streaks
4. Scrub the solution in with a brush.
You should see the suds getting dark and dirty as the buildup comes off.
5. Rinse well.
If the surface is shadowy, a light cleaning with a phosphoric acid cleaner may be enough to brighten it the rest of the way.
Don't use any acids stronger than phosphoric, as it will damage the brick or stone.
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