 Because brick's also a bit soft. I would use a wire brush. You would pick one up at a home center or a hardware store. It's got a stiff wire bristle. And then I would try to use that wire brush to brush off and brush those areas where the stains are. And you've got to be careful because you don't want to damage the brick too much. If you scratch it a little bit, that's okay. Even if it looks a little lighter than the surrounding areas, eventually it'll sort of fade together. But that's probably the first step. And if you want to go deeper than that,