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The wash the brick mason is talking about is an acid wash. That should take care of the white stains. As far as the vertical brick looking a different color, the acid wash should take care of that too. However just like fabric and woodgrain anytime youbturn a material from horizontal to verticalbit will appear to be a different color because the grain pattern in the material is running differently and reflects light differently.
The acid wash should help with the motor color. As it ages it will naturally darken and blend.
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