Hydrogen peroxide, or hydrogen peroxide solution, 3% hydrogen peroxide solution is commonly used as a disinfectant and antiseptic treatment for wounds and inflammation. The drug does not usually show this when it comes into contact with normal skin, while with blood, pus and tissue necrotic material an oxidizing reaction can occur, resulting in the symptom of crackling. When one has an otitis media, hydrogen peroxide is an optional treatment for cleaning the ears. After pouring hydrogen peroxide into the ear, hydrogen peroxide contact with pus decomposes into water and oxygen to produce a large number of bubbles, and when the bubbles rupture, we will hear a crackling sound. Hydrogen peroxide ear cleaning can achieve the role of rinsing purulent secretions in the ear canal, disinfection and sterilization, softening ear wax. The correct steps for cleaning ears with hydrogen peroxide are, first drop hydrogen peroxide into the inside of the ear canal, then soak it for 5~10 minutes, use a dry cotton swab to suck up the hydrogen peroxide, use saline to drop into the ear to clean it, and then use a cotton swab or cotton swab to suck up the water in the ear. If you need to use hydrogen peroxide to clean your ears, please go to the ear, nose and throat department of the hospital to be operated by a professional physician.