I would try abrasive (honing powder) plus surfactant (Tide?) with black stripping pad, working all of that with a swing machine.  

Santa Fe Floor Care
On Jul 15, 2018, at 6:41 PM, Roger Konarski (via sccpartners list) <sccpartners@stoneandtilepros.simplelists.com> wrote:

I have asked for help with a grout issue. Cement tiles , sealed numerous times with miracle sealant. The black grout left a slight black haze around the edges. Pls see the attached pictures from attached email. Would appreciate any recommendations to remove the black haze.


Roger @ Restoration Stoneworks LLC 

----- Forwarded Message -----
From: Roger Konarski <qm144@yahoo.com>
Sent: Friday, July 13, 2018, 10:57:36 AM CDT
Subject: Black Grout Haze

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