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anything regarding the staining of tile or stone including efflorescence

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This type of staining normally means it is being subjected to moisture, which perpetuates staining of this type when the moisture comes into contact with iron oxides.

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Normally when your sealed Saltillo tiles have a whitish or cloudy appearance, it means that moisture is trapped under the sealer.

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Marble is made of a calcium carbonate material which tends to be more susceptible to staining.

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Sanded cementitious grout has sand in it. There is a chance that grout was not as hard as it should be and when it was cleaned it caused the grout to degrade to some degree.

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