I had plaster pulling away from my brick walls. There was no lathing between the brick and the plaster. I've removed the plaster. What is the best way to prepare the brick for some sort of sealing treatment? I wonder if I need to use a wire brush to remove any plaster left behind or just do some minor scraping. I figure I need to vacuum it to remove as much loose shedding of the bricks which is caught in the mortar. From there I would like to know what sealing product to use and best way to apply it. Spraying makes sense to me. Any feedback would be appreciated.