Question: how to use hydrogen peroxide to lighten arm hair?
Answer: Mix ¼ cup (60 milliliters) of 3% hydrogen peroxide with ¼ cup (60 milliliters) of filtered water. Apply the solution to your arm, and wait 30 to 40 minutes. Wash the solution off with cool water and pat your arm dry. If it starts to feel uncomfortable before the time is up, wash it off.