First you need to find out why..Is it a grout film? efflorescence? etc
I have seen this happen with certain sealers as well

On Thu, May 31, 2018 at 7:58 AM, <> wrote:
Hi partners,

Will try to resolve this grout haze issue on this Brazilian honed slate on Saturday (pics below).
Apparently it’s just regular grout and they used dry treat to seal it.
Was installed several months ago so I will just try the least intrusive method possible and go from there.
Would appreciate any ideas
Thank you,
Chris Santospago
Restoration by design stone

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