Grout lines between the tiles are a key component of both the appearance of the installation as well as the strength and resistance of the tile. Grout creates the sealing layer that prevents moisture from seeping behind tile walls and floors to create damage. If grout is damaged or attracted to mold, you can remove some of the grout without removing the tile. A Dremel tool can make this work faster and easier.
Tools to use
To make this project as easy as possible, have in your hands a Dremel rotary tool, which has a swivel head with a speed of thousands of revolutions per minute. For this work, use the Dremel bit number 569, which is designed to cut into stone and similar surfaces without performing too quickly. However, if you have a great job to do, you may have multiple bits, which can slowly wear down, and a bit dull or worn creates more ripping and presents greater danger to the tile.
Dremel Accessory
Dremel makes an attachment head for rotary tool called a grout removal fixture; This is the perfect tool for the job. The accessory features an angle bracket that has the drill bit at an angle so that it can be easily torn in the grout without hitting the tile. The union also has guides that help you stay in the grout line and avoid cutting or nicking the tile. Find this accessory, as well as the tool and bits, in hardware stores and at home improvement.
Methods
Attach the bit, then the removal attachment, to the rotary tool. Set the rotary tool between 15,000 to 20,000 rpm. Start at the top of the extraction area and its working form; Pulling it down allowing better control to push it up. Work slowly so that you have optimal control and are less likely to slide. Grout Joint has multiple depth adjustments to allow all grout to be removed if necessary. Even if you want to remove all the grout, start with the most superficial setting and make several shallow passes, work more deeply on the surface slowly, rather than in a single deep pass. This gives you better control over the removal process and slows down the bit's wear.
Tips
Work slowly to avoid slipping, but also pay attention while moving slowly to no resistance the bit is felt in the grout. The placement of older tiles have metal tile spacers that are embedded in the grout; If you hit one of them unexpectedly that will send the wobble bit and could cause damage to the shingle. If you are going to remove the grout just to remove the mold, just go as deep as the mold penetrates the surface. For corners and horizontal areas, you may need to remove the fixing grout to hit different angles; Just remember to work slowly and shallowly, even without the accessory present.