PRE-TREATMENT TO CLEAN GROUT BEFORE APPLYING GROUT MAGIC Grout Magic Pre-Treatment is a very effective easy to use grout cleaner. Grout Magic Pre-Treatment is a unique specially formulated pre-treatment to prepare the grouted joints before the application of Grout Magic, which re-colours and seals grouted joints in floors and walls. Only use on non-porous tiled surfaces. PRODUCT FEATURES QUICKLY REMOVES STUBBORN STAINS FROM GROUT ON WALL & FLOOR JOINTS CAN BE USED ON AND AROUND PLASTIC & ENAMEL BATHS & SHOWERS SIMPLE TO USE & VERY EFFECTIVE Prior to application, if mould or mildew is present on the wall or floor grout, use Mould and Mildew Remover. Grout Haze Remover can also be used when there is cement or mortar residue on wall or floor tiles.