Forever White Grout Reviver is the easy way to restore discoloured and dirty grout to a bright white finish. Simply apply to grout lines using the easy to use applicator, allow to dry and remove any excess residue with a damp cloth. Depending upon size of tile, will cover approx 20m squared of tiles. Contains Mould Shield for long lasting protection against discolouration caused by bacteria, mildew and mould growth.