Getting clay stains out of brick/stone

[s219]

Need to get clay stains off the foundation of our new house now that construction is finished. Anybody have suggestions? I plan to try a pressure washer on a test spot, to make sure it doesn't damage the brick finish (it's a sand-glazed brick). But in the past I have seen clay stains be quite resistant to a pressure washer, so it may not work even if it's safe on the brick. Want to avoid acids if possible. I need to go around the whole perimeter of the house.

 

[deerefan]

Need to get clay stains off the foundation of our new house now that construction is finished. Anybody have suggestions? I plan to try a pressure washer on a test spot, to make sure it doesn't damage the brick finish (it's a sand-glazed brick). But in the past I have seen clay stains be quite resistant to a pressure washer, so it may not work even if it's safe on the brick. Want to avoid acids if possible. I need to go around the whole perimeter of the house.

That is a big problem in my area. We lay hay and/or fabric down to prevent the clay from splashing on the house/building. A pressure washer with hot water usually works, the hotter the better.