To clean a stone fireplace you will need to have Trisodium Phosphate (TSP), a bleaching detergent and warm water. Mix the TSP in the warm water as per the instructions on the package and add some drops of the bleach to the solution. Cover the fireplace floor with a plastic cover then wet the fireplace stone with the solution and scrub using a sponge until it is clean.
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how do i clean a stone fireplace