Washing grease off your hands without using soap is very difficult. This is because soap has special properties that pull oil and grease off your hands and suspend them in the water. Soap is made up of molecules that break up oil and grease into smaller drops. One end of the soap molecule will attach itself to the oil drop and the other end will attach itself to water. This causes the oil drop to become suspended in water and easy to wash off. Contrary to popular belief, not all soap kills bacteria. Only anti-bacterial soap kills bacteria effectively. If you wash your hands with non anti-bacterial soap, you need to rub your hands together vigorously to ensure that all the bacteria has been washed off.