You need to keep your humidifier clean. Regularly cleaning the tank is a core part of humidifier maintenance. It helps to eliminate harmful bacteria and microbes. Here's how to go about cleaning a humidifier: Step 1: Start by unplugging the humidifier. Step 2: Next, fill it with 1 cup of white vinegar and 1 cup of water. Step 3: Leave the solution to sit for about an hour. The vinegar will help to loosen stubborn residue and disinfect the device. Step 4: Now you can empty, rinse, and dry the base and tank of the humidifier. Clean your humidifier at least once a week.