bal do a microban grout..great product to combat mildew etc......dave..
BAL Microflex Wall Grout
A White cementitious tile grout especially formulated with built-in MicrobanŽ antibacterial protection to inhibit the growth of bacteria, such as Listeria, Salmonella, E-coli and black mould. It provides an added level of hygiene protection in bathrooms, showers and food consumption areas. The grout also has built-in admixture to provide flexibility and to enhance the bond to the edges of tiles and mosaics. Conforms to BS EN 13888, Type C, Class G2.