What is the best way to clean white bleed (from aluminum siding) off brick?

Question:

Answers:
I would use TSP ( Trisodiumphosphate ) this can be purchased at Lowes or Home depot in the paint department. The beauty of TSP is that you can start with a mild mixture and mix a stronger batch if needed. Muriatic acid might discolor the brick. Before I cleaned the brick, I would address the problem with aluminum siding finish. It should be washed with an appropriate siding wash and a medium bristle brush.