Thus, the present invention provides a composition in powder form comprising highly dispersed silica particles, polymethylsiloxane particles, and at one or both of a cationic surfactant and an antimicrobial substance, wherein at least 25 pcnt by weight of the cationic surfactant is present in primary polymethylsiloxane particles carrying the cationic surfactant on their surface and/or in agglomerates of these primary particles, and/or at least 25 pcnt by weight, of the antimicrobial substance is present in primary highly dispersed silica particles carrying the antimicrobial substance on their surface and/or in agglomerates of these primary particles.
