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I will assume you are not cleaning it with acid cleaners. There is a possibility that there is some residual acid in the grout or the pores of the stone that bleeds out when you take a shower. Try rinsing the shower wall with a solution of baking... Read More

Flamed granite has a rough texture which will tend to hold dust and dirt. Prepare a solution of stone soap or neutral cleaner and warm water. Flood the floor with this solution and either agitate with a scrub brush or machine-scrub. Pick up the... Read More

There are many on the market. But if your shower walls are marble, you will have to use caution in choosing the proper cleaner, since most soap scum removers are acidic. Do not use an acidic cleaner on marble walls! If the tile is ceramic or granite,... Read More

Pickled Mexican clay tiles are pickled at the factory. It is difficult to re-pickle the tile after it has been installed. This is a job for a professional, and it will be very expensive, since all the grout will have to masked to keep the pickling... Read More

These white streaks may be hard-water deposits, which can prove very difficult to remove. Suggest that they try a sulfamic acid-based tile-and-grout cleaner -- Stonecare PRO Signature’s HEAVY DUTY Tile and Grout Cleaner. CAUTION Make sure to... Read More

If the spots are light a #00 steel wool pad may remove them. Use the steel wool dry. If the deposits are heavy use a solution of sulfamic acid and water. Sulfamic acid is sold under the name of sulfamic acid crystals and is used for cleaning grout.... Read More

All acids should be used with caution on any stone surfaces. Granite is one stone type where most acids will not harm it. However, stay away from hydrochloric acid (HCL). HCL can deposit salts in the granites pores if not rinsed throughly. I would... Read More

The marble tile was most likely improperly installed. Before you grind a floor you should sound the floor by tapping on each tile with a broom handle. If you hear a hollow thud sound then there is a strong chance that the tile has no setting material... Read More

The material you are describing is probably a marble known as rossa perlinio. This type of marble, when it is formed has mud running through it and this is what the soft veins are---mud. Unfortunately the only cure is to fill the veins as the erode... Read More

If you intend to grind the travertine flat I would grind and hone to about a 120 grit. Apply the filler after the 120 grit. There are several fillers that will work. There are products that are called traverfills or you can use a non-sanded grout.... Read More