What is Dettol Anti-bacterial Hand Hygeine Gel? You can stay safe on the go, with a formula that helps to protect against harmful bacteria and viruses. This hand sanitiser kills 99.9% of bacteria and viruses, with no need for soap or water. How to use Dettol Anti-bacterial Hand Hygeine Gel Squeeze a thumbnail size amount in your palm & briskly rub hands together until dry. Use between washes. No need to use water.