STONTEX GROUT 2 NEW PRE TREATMENT CLEANER
This is a special cleaner to use before applying the Grout 2 New treatment product. When applied correctly it will both clean and open up the pores of the existing grout helping the Grout 2 New penetrate deep into the grout for maximum long lasing protection. This product is slightly acidic so ensure you wear gloves and be extra careful when using around acidic sensitive material like natural stone tiles.
Why not consider re-colouring your grout, check out this product https://www.ultimate-floorcare.com/collections/hardfloor/products/grout-2-new