How to Clean Fireplace Stone

Updated July 20, 2017

Stone fireplaces are often a selling point in houses. They are a wonderful focal point in a room and add comfort and warmth during the winter months. People who use their fireplaces often, though, may notice that cleaning stone fireplaces can be challenging. Soot and smoke cause a black residue to build up, making stone fireplaces look dirty. Some chemicals can bleach or discolour your fireplace stone; before you start cleaning, get prepared with the proper stone fireplace cleaning supplies in order to preserve the look of your stone.

Lay a plastic dust sheet down on the rug or flooring around your fireplace to avoid damaging your floors while cleaning. Tape the edges down so the dust sheet does not move during cleaning.

Fill a large bucket with 1 gallon of hot water and another bucket with warm water. Set aside the bucket of warm water.

Pour ½ cup (8 tsp) of Trisodium Phosphate (TSP) into the hot water and allow it to dissolve.

Put on rubber gloves to protect your skin from the cleaning solution.

Dip a scrub brush with very stiff bristles into the cleaning solution and begin scrubbing the fireplace stones.

Rinse the fireplace stones using a sponge and the bucket of clean, warm water.


If your fireplace has an excessive amount of soot and smoke build up, you can increase the amount of Trisodium Phosphate to 1 cup. However, this solution is very strong so you must be very careful not to let the solution touch your skin or furniture.


If the solution accidentally gets in your eyes or on your skin, flush with water for 15 minutes. Do not allow the cleaning solution to run down the fireplace stones, as they may leave streaks that are hard to remove.

Things You'll Need

  • Plastic dust sheet
  • Tape
  • 2 buckets
  • Water
  • Measuring cup
  • Trisodium Phosphate
  • Rubber gloves
  • Scrub brush
  • Sponge
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About the Author

Amy Dunay graduated from the University of Delaware with a major in business and technical writing. She has been a professional writer for 10 years and currently works as an editor and freelance writer. Dunay has had articles published on, and several other online informational sites.