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Suppose you have an interior granite wall that had some silicon caulking used in the grout joints. The silicon then caused staining along the grout edges. A poultice successfully removed the staining, but then later, the stains reappeared. What... Read More

The mildew on you grout has penetrated deeply. To remove it, you will have to prepare a mixture of bleach and an abrasive cleaner like Soft Scrub. Apply the thick mixture to the grout with a paint brush and allow it to set overnight. Rinse the thick... Read More

Yes, it is possible to recolor the grout, but it needs to be thoroughly cleaned before re-coloring. If possible, find out what brand and type of coloring was used, and re-apply the same brand or type. TIP Before attempting to recolor the grout make... Read More

There are several grout paints and dies on the market. But be aware that coloring grout can be a tedious task requiring great patience and a steady hand. It is also extremely important that the grout be thoroughly cleaned; otherwise the color will... Read More

The white deposits are salts, which are bleeding through from the grout joints or from the mortar. An acid wash will be required to remove the salts. If the deposits are heavy, try scraping them off before washing the slate with acid. Several acid... Read More

Many brands of grout sealer are available for this purpose; most are easy to apply, but make sure the grout is first cleaned thoroughly. Grout sealers are available at most hardware and home supply centers. TIP Most of the silicone impregnators sold... Read More

Several grout cleaners are available at your home center, hardware store or janitorial supply store. These cleaners are acidic, so caution is advised. Once the grout is cleaned I would suggest applying a good grout sealer. You may also want to... Read More

Several excellent grout cleaners are available from your stone care supplier that will not dull polished marble. Try a mild solution of bleach ; use a soft tooth brush to apply the solution to the grout joints and scrub lightly. TIP If the grout is... Read More

Yes, you can replace the missing grout. Be sure to use only unsanded grout . You will also need to wait 24 hours before proceeding with honing or you can wait until you have polished the floor and then replace the grout. Matching the color of the... Read More

This is a condition known as efflorescence. There are soluble salts in the grout coming to the surface. The large amount of water you used dissolved the salts and they are depositing on the surface. Efflorescence will eventually disappear when the... Read More