Tile grout can be difficult to keep clean, especially in your shower where it is regularly wet. Warm moist areas create the perfect environment for mildew and mould to grow, so it is understandable that you want to keep your shower as clean as possible.
Tile grout is the hardened material that fills the space in between your tiles and keeps the water out. It is essentially a combination of cement, water and colourant that is applied under pressure to avoid gaps and achieve a smooth watertight finish to your shower and bath area.
Because grout is porous, a sealant is usually applied to prevent any breakdown in between the tiles over time. However, grout can be damaged, and this can cause water to seep through the tiles and compromise the integrity of the waterproof membrane, or worse, leak and damage the building structure.