To remove the rust in the humidifier, you can clean it with a small brush and special detergent. You need to brush the detergent with hot water at about 60 degrees and then fill it four or five times.
You can also use white vinegar to clean the humidifier. Pour the new water and white vinegar 1:1 into the water of the humidifier for about half an hour, rinse the humidifier with clean water, and clean the humidifier with white vinegar. It is also necessary to clean the white vinegar. Be sure to restart the vinegar four or five times, otherwise the acidity of the vinegar is easy to corrod the humidifier parts.
For some household affairs and more difficult to clean up, you can add ten boxes to put some crushed rice or beans, and then add water to shake the humidifier box vigorously until the water becomes cloudy and then pour out the water. You can find that because the friction between the rice and beans will take away a lot of rust, the water box will become much cleaner.