What Does "Kills 99.9% of Germs" REALLY Mean?- hand sanitizer kills 99.99 of germs ,If a disinfectant claims that it will kill 99.9% of germs, it should kill 99.9% of the flu germs on a given surface, right? And, if killing 99.9% of germs is good, then a product that says it will kill 99.99% of germs should work even better, right? WRONG. On both questions.Medex Hand Sanitizer, 70%+ Alcohol, Kills 99.99% of Germs ...MedEx Instant Hand Sanitizer is formulated with plant-based oils and skin conditioners, with 70% alcohol. High potency sanitizing power that kills more than 99.99% of illness-causing germs. Use multiple times through the day, with disc top cap for easy dispensing and portability.