Disinfection of contaminated motion picture films and magnetic tapes was carried out in sealed metal cans, having at the bottom and at the lid filter paper discs soaked with 2.5 per cent of 4-chloro-3-cresol dissolved in 96 per cent ethanol. The contaminated surface of audiovisual recordings may be cleaned with a well squeezed soft cloth moistened with 4-chloro3-cresol dissolved in 96 per cent ethanol. The contaminated bobbins may be treated in the same way. Disinfection of air in store-rooms was carried out by using 1 or 2 per cent of 4-chloro3-cresol in 96 per cent ethanol solution at the amount of 1 g of the microbioside on m³.