How to remove staining from polished granite?

Mark Dadian

New Member
A bank has asked me to clean their fascade of polished pink granite. What appears to be happening is
the aluminum from the flashing above and the letters on its face are causing the streaks.

What will be effective in getting this off without etching the aluminum lettering and the polished granite?

Thanxx in advance.

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GBU

Mark A. Dadian
 

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