Answer by  
                                                                                          Brandon55 (1719)
                                                            
                          
                          
                                                           The most common methods are power washing, sand blasting, lye, solvents, stripper, and paint thinner. Usually it takes a combination of these. I would start by power washing the brick if is on the outside. A wire brush and solvent will take almost all the paint off, but is slow.