I have an interior brick wall that is not very attractive, and seems to be deteriorating. The mason(??) who installed the wall was very sloppy, getting mortor on the brick surface. This is an old job, and the mortor is begining to disintegrate. (1) Is there a way to clean the brick without destroying my wall to wall carpet? (2) what is the best way to deal with the grit that is falling from the wall, without having to totally redo the whole wall?