Looks like the topical failed/degraded.
Strip off remaining topical
Then maybe a light acid dilution
I would test a small area as the face of tiles look like they could be damaged
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> On Aug 23, 2018, at 11:08 AM, Tony Deluna <email@example.com> wrote:
> Hey pros what would you guys use to clean this quarry tile around the swimming pool?
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> Tony DeLuna