Whole house needs to be repointing so I tried in an inconspicuous area to practice. This white residue appeared and won't come off with a wet sponge.
- I'm using Spec Mix tuckpointing mortar type O. Higher lime content than other mortar.
- I have Chicago common brick, it's soft and quite chipped around the edges. Can't really get a clean joint, so I used a wet sponge to smooth the edges, but I think it kind of made a slurry on the face of the brick?
I'm assuming diluted muriatic acid wash will take it off? How do I prevent it to begin with if possible?