Here is the answer that has been posted before:
Removing paint or varnish from brick is always a challenge. And no matter how hard you try, there will always be a residual of “paint points” in the brick. The method I have used and like the best is to use a 7″ hand power grinder, using a 40 grit carborundum disk. This really rips the old paint off but doesn’t seem to damage the surface of the brick. Hearing, eye and ear protection are a must……and having arms like Arnold Schwarzennegger is a big plus, as the arms do get a bit tired after a while. But its fast!! An acid wash following the grind off process will help get most of the paint off. Try 1491 Acid which is more user friendly than Muratic and safer. Still a chemical hazard namely if it gets under a finger nail so always where chemical resistant gloves and eye protection. Hope this helps.
Greg
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