Most wall and floor grout is water resistant. This means water can penetrate the surface of the grout but not affect the grout. To help prevent the grout from staining over time, it is best to seal the grout once installation is complete. Using a product such as LTP Grout & Tile Protector will help stop your grout from absorbing dirt and grime.
LTP Grout & Tile Protector is an aerosol spray that forms a colourless barrier helping to protect porous wall and floor grout joints. It is easily applied by spraying the grout joints. Any overspray completely dissipates leaving no residue. It stops penetration by water, dirt, oil grease and limescale. This makes treated areas much easier to keep clean.