What is the best method to clean a garage floor and a driveway. Also should i seal the cement as a maintainence procedure.

We have some brick siding that appear to be a decorative facade to our house; the brick siding goes up about five feet from the ground. There is a long crack in the brick siding and some of the bricks appear to be in the beginning stages of crumbling. Also, there are cracks in the stucco/concrete siding, which appear to be above the basement window wells. So I am dealing with both a brick and a concrete issue, but don't know if it is structural or not. We had a home inspector tell us that it was not structural, but I'm still suspicious. The question I have is who do I call to come out to do this kind of repair work? Is it a mason or a concrete company or who? Thanks.