Carl makes a good point-you can use a heat gun to see if you can dry a small area.
How porous is the stone-that will help give you some info to work with.
However I would guess if it isn't moisture the cleaning process pulled the "color enhancer" from the face of the stone.
Try stripping off a tile with paint striper-if it removes the enhancer(if that what it is)-there you go.
May be able to go over it with a good quality enhancer and be done.

On Thu, Sep 3, 2015 at 1:45 PM, cpstaples <cpstaples@msn.com> wrote:
check it first with a moisture meter to see if the darker streaks are wet


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-------- Original message --------
From: Stuart Young
Date:09/03/2015 1:38 PM (GMT-05:00)
To: SCCPartners
Subject: Granite



This granite has been power washed several times and then a bleach solution was used on it, resulting in streaking. Any ideas on hot to make the streaking go away?
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Regards,
Stu Rosen
201-446-1200

"EVERYTHING MATTERS"