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Short of removing it and installing new grout I would try cleaning it with stone soap or neutral cleaner. Be sure to use a soft brush and scrub the grout lines throughly. If this does not throughly clean the grout you may need to replace it. TIP The... Read More

The are many reasons why the grout becomes powdery. If the tile is very absorbent it will soak up most of the moisture from the grout preventing it from curing properly. Too much water added to the grout mix can also make the grout powdery. To repair... Read More

The are several reasons why the grout may have cracked. The installer may have used too much water when he mixed the grout causing it to crack or there may be movement in the floor causing the cracking. To repair the grout you can overlay a thin coat... Read More

The best cleaner to use for removing grout residue from a granite floor is sulfamic acid. Sulfamic acid is sold as a grout cleaner and works well on granite surfaces. Do not use on marble or limestone since the acid will etch these surfaces. Sulfamic... Read More

There are several ways to remove this residue. First try using a solution of stone soap and warm water. Apply this solution with a string mop and pick up with a wet vacuum. Next time you polish granite with black grout lines add a small amount of... Read More

You bet. Creme of tartar can be added to the grout mixture which will make it dry faster. (That’s right, it is the same creme of tartar that you buy at the grocery store. ) TIP There are several pre-packaged mixtures that are designed to fill... Read More

The yellowing is caused by the steel wool you are using reacting with the recrystallization fluid. It may also be from the waxes that may be found in the recrystallization fluid. To remove the yellow color you will have to scrap the grout with a... Read More

Some grout colors can be bleached by the oxalic acid in polishing powders. You are always urged to perform a small test to determine if this might happen. It is possible to recolor the grout. There are several companies that sell grout colors which... Read More

Yes, there are several fillers that can be used that will take a polish. If the area is small you can use a polyester filler. These polyesters are sold at marble supply houses as Akemi, K-bond, Chemolit, etc. You will only be able to fill several... Read More

There are several ways to eliminate the white residue in the black grout lines. First you may want to add a stone soap to your rinse water. Stone soap will clean the grout lines. If this proves ineffective you can add a small amount of black dye to... Read More