We have a very large brick house that @ one time was covered in vines on parts of the house. I plan on power washing the entire house using a chemical masonary wash, point up the brick as needed, then spray with a silicone sealer of some sort. QUESTIONS: should I point the brick before washing or after and what kind/brand sealer should I use. It was brought to my attention that a plane masonary sealer will not work, the brick needs to breathe and not trap mositure in the brick. Any comments please.,  thank you.