Hi I was wondering if you could tell me what this white stuff is that is all over the exterior brick on my house. My lower half of my house is red brick and the upper part of my house is a blue vinal siding. It looks like its running down off the siding. We have tried to clean it off with the regular stuff we use to clean the house but its still on the brick. Can you tell me what it is and how we can avoid it and what to use to clean it off?
Thanks you !

TSP should work, you'll have to do a little scrubbing to get it off. The finish on the siding gets chaulky over time, might be time to paint it.