The pre-surgical hand washing process involves alternating brushing of both arms in the order of fingertips, hand, wrist, forearm, elbow, and lower third of the upper arm. The standard pre-surgical hand washing process is to first expose one-third of the forearm, then wash the arm and elbow with soap and water, then use a sterile brush dipped in sterile soapy water to scrub the fingertips, hand, wrist, forearm, elbow, and lower one-third of the upper arm, alternating between the two sides of the arm, and each time scrubbing should not be less than three minutes, and when rinsing, you need to ensure that the fingers are facing upward, and elbow in the bottom of the principle of rinsing, and a total of three times. A total of three washes are required, followed by wiping away with a sterile triangular towel, and finally a five-minute soak with a disinfectant such as ethanol or iodophor. Surgical preoperative handwashing involves ensuring that both hands are relatively sterile after washing, and the exact procedure can be found in textbooks.