Rubbing alcohol may do more harm than good on open wounds. “It will burn and sting,” she says. “Rubbing alcohol also changes the skin’s pH level and disrupts your skin’s barrier.

Make a mixture of equal parts rubbing alcohol and water in a microwave-safe bowl, like 1/2 cup of each. Place the bowl in the microwave and heat it for 1-2 minutes to create steam that softens grime.

Following is a transcript of the video. Randy Li: "You should clean your wounds with rubbing alcohol." Lorena Concepcion-Martinez: Ouch! Li: "Slap a choking person on the back." Concepcion ...