Thermal Bluestone

by Steve
(New York)

I have about 2,000sf of this installed new. It is stained from something and I can't figure it out. Tried several masonry cleaning solutions that worked but then after a few days it was back again worse than ever. I have a water softener plant so I don't think it is my water. looks like it is the mortar joints. I can send pictures but need an email.

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