Cracked and stained grout not only is an eyesore, but can lead to damage hidden beneath the surface of the tile, as well. Improve the appearance of the grout and prevent water damage by installing a new layer of grout. Start by removing an eighth of an inch of the uppermost layer of existing grout with a grout saw (a tool about the size of a toothbrush that is used to remove grout). Next, rinse the area thoroughly with fresh water to remove dust or loose grout. Apply a new layer of grout using a rubber float, wiping off the excess with a damp sponge. Finish the job by polishing the haze that remains with a soft dry cloth. Seal the new grout after it has had a few weeks to cure. And that's the On The House tip for today.