1. Removing the old grout
Using a grout rake, remove the old grout at least half the thickness of the tiles, taking care not to scratch the edges, or nearby fixtures such as shower heads. Start by removing the grout from the vertical joints before moving onto the horizontal ones. After the old grout has been removed, you can apply fresh, new grout.
Grout can be purchased in powder form and mixed with water, or pre-mixed and ready for use. Whichever you opt for, ensure you have enough for the area you want to cover, and that it is waterproof. Grout is also available in a variety of colors to complement or match your tiles.
2. Apply the grout
Using a trowel, press a small amount of grout onto the surface of the tiles. Spread it using a grout spreader – apply long, upward diagonal strokes and work it into the joints between the tiles. Continue until all the joints are grouted. It is essential to move fast as the grout will harden quickly.
3. Remove excess grout
Once you’ve finished applying the new grout, use a damp sponge to remove any excess from the tiles. Be careful to avoid dragging any grout out of the tiles.