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What are the bristles on the brush made of? Could you get away with brass or even steel or would it damage the brick?
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You can get poultice cleaners which are paste that goes on and peels off taking the dirt with. Used for cleaning dirty stonework on/in historic buildings. Not sure if man enough but could be worth investigating.
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Sorry to tell you, but this almost definitely won't work.
You need a sand blaster.
Also be prepared for the inside where a fire sits to still be black after being sand blasted.
withered_preacher
Sheppz
hugo7
@andos
Marginal gains?
It’s the most disheartening task ever. Even after 10 mins with a wire brush on the same stone the difference is so minimal. Blurgh