A scraper/digger tool works similarly to a plow used for loosening and turning dirt, but is much smaller. The tool is thin and curved with a small tooth attached. When using the tool, the grout will come out from between the tiles. Because the small tool works like a plow, caution should be used not to scratch the tile next to the grout.
Several bits referred to as dremels are available to attach to a drill to remove grout. The dremel tool comes in several sizes used for different types of tile and grout. If the grout between the tiles is less than 1/8 inch wide, a 1/8-inch or 1/16-inch dremel bit will remove the grout. These bits are also used on wider grout lines. The dremel tool rotates similar to any drill bit, but is designed for removing grout rather than drilling into wood.
Along with grout removal tools for the drill, manual tools will assist in the grout removal process. Tools such as an old flat-head screwdriver and metal putty knife finish removing grout along the tile. Use these tools to remove any remaining grout without the risk of scraping the tile surface and sides with the drill. Use a wet/dry vacuum and broom throughout the removal process to ensure all the old grout is removed.
After the grout is removed and replaced, use a grout sealer to avoid further discoloration or dirt in the grout lines. Clean the grout routinely with equal parts water and a pH-neutral cleaner to keep its clean appearance. Grout cleaning products are also available. For fast and effective grout cleaning, use a deck brush to scrub the grout and tile and rinse it by mopping the grout with hot water.