Abstract: Having a beveled prying edge and a notch for frictional interfitting with a chisel shaft, the removable chisel blade of this invention provides a significant improvement to the process of removing mortar leakage, grout, or spalling from the surfaces of concrete walls. The heat-treated, hardened steel blades have a sharp edge to pry the grout drippage from the surfaces without driving the grout into the surface and without biting into the surface itself. A notch is cut in the body of the blade so that the blade will slide into a throat on a chisel shaft and will frictionally interfit through wedging action with the chisel shaft. Beveled side portions of the tapered notch sides provide improved frictional interfitting. Also, beveled inset grooves on the body of the chiseled blade provide improved frictional interfitting and reduce the tendency of the chisel blade to wiggle in the plane of the blade.