We had a similar situation with a floor installation. On a vertical surface, this would obviously be more challenging, with limited dwell time.

The installer applied grout sealer, which appears to have bled into the stone. To resolve the issue, we applied an alkaline cleaning product (Modern Clean by Modern Stone Technologies) to the floor, scrubbed with a tampico brush on a floor machine, & extracted with a truck mount. I've attached a before and after picture. If you look closely at the after, you'll still see some residual discoloring, but overall it worked well.

Blain Haeg
Gold Standard Floor Care
512.257.3070 office
512.750.1242 cell

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On Sun, Sep 11, 2016 at 3:24 PM, Justin Cameron <justin@jmcstoneandtilecare.com> wrote:
Got this email some suggestions on cause and a remedy
Thank you

Sent from my iPhone

Begin forwarded message:

From: Haresh Mehta <haresh.mehta@icloud.com>
Date: September 11, 2016 at 11:26:22 AM PDT
To: Justin Cameron <justin@jmcstoneandtilecare.com>

I am sendding you some pictures.
this projecctwas done in mid March. Mason told us that these stains will disappear as it is  caused by moisture absobed by stone . we have been waitng for. five months with not much luck. He thinks is caused by alkaline staining.
I wonder if there some way to remove these stains. He is suggesstig paiting the fireplace.
Thanks for your very prompt response
Haresh Mehta

Haresh Mehta

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