PentaUSA Grout Reviver - Ready Mixed Grout, Tile Adhesive, Fast Drying, No Sealer Required, Perfect for Bathroom, Shower and Kitchen + Mould Protection - 250gr (White). Use the PentaUSA with the spatula grout kit on the tile in the bathroom to freshen up the appearance of your shower, bathtub, sink, or windows.
eBay