The Girl and the Olive Hand Sanitiser with Olive Leaf Extract is effective because of the natural broad-spectrum antibacterial, antifungal, and antimicrobial properties of tea tree and lavender oils. Lavender oil in particular has been shown to be effective against a range of antibiotic resistant strains of harmful bacteria. Being 60% alcohol based means that it effective against viruses.   
Spray or squeeze on hands and air dry.