Good morning, customers had this granite countertop installed June 2015. The installer has since cleaned and sealed with Tenax pro-sealer. The customer insist that then have not used any cleaner except soap and water. The photo on top is a piece that has been sitting outside since the install. Only the used countertops are darkening.
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We will need more info-I doubt the entire surface has darkened-when you make your visit test porosity of the stone.
It may just be oil stained-in some areas.
Some folks will buy and apply all kinds of "stuff "(look under the counter) to protect and keep their stone looking its best.
You will find a build up of that "stuff " may be causing the issue.
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