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When there is a white haze on a shower floor it is normally either efflorescence precipitation or you have trapped moisture in the tile assembly by applying a non-breathable sealer over the floor.

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Although by definition a porcelain tile is impervious, it can still get dirty. Depending on what kind of texture the tile has on its surface and whether it has micro pores, as many do, some porcelain tiles can have a tendency to collect dirt and not clean easily.

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There are many variables to consider. First you have to know what type of tile was installed. Whether it is a glazed tile (impervious glass-like surface) or unglazed tile (same clay material form top to bottom). If it is an unglazed tile is it porous?

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Since you don’t see the purple stain in the pink tile, but you see it in the white tile, and you can’t clean it, it sounds like you have a microbial staining or mineral staining showing through the white tile.

Ceramic and Porcelain TilecleaningExpert AnswersMaintenanceMoldStains
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The reason you will get mildew on the tile in a shower is because the water is not draining or drying properly. This could be cause of the tile not being installed correctly with the correct slope on the tile floor.

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You might have more than just a lack of maintenance problem. If you have mold on the tiles, then the tiles are being subjected to excess moisture.

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You might have a cementitious grout haze over the tile or a latex residual haze from the grout or thin-set adhesive. There are products for removing those types of conditions.

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Granite counter tops are normally fabricated to a high polished surface that makes it easier to maintain.

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