You should wash your hands with soap under running water for at least 20 seconds after exposure to bloodborne pathogens. It is important to scrub all surfaces of your hands thoroughly, including the backs of your hands, between fingers, and under nails. If visible contamination with blood or other potentially infectious materials occurs, wash as soon as possible with soap and water. In emergency or high-risk situations, such as direct contact with blood, hand washing should be thorough and immediate. A useful tip is to hum the "Happy Birthday" song twice to keep track of the time while scrubbing your hands. After washing, rinse your hands well under running water and dry them with a clean towel, using the towel to turn off the faucet if possible. In addition to routine hand washing, if there are no hand washing facilities available, antiseptic cleansers or towelettes may be used temporarily, but washing with soap and water should follow as soon as feasible. These guidelines are recommended by health and safety authorities to effectively reduce the risk of transmission of bloodborne pathogens through hand contact.