For two years we have been trying to remove stains on glazed tile installed as an interior floor. The stains appear as white areas and contractors have told us they come from water vapor rising from our concrete slab. I did attempt to restore a portion of the floor with muriatic acid, kutzit, and a renewed application of Val Oil (which was put on the floor originally). That approach is expensive, difficult, and delivers fragile results.
Is there any help for these dark tiles? Do you know of a product that can restore them or at least remove the stains? We are trying to sell the house and the tile problem is quite visible.