This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to clean a warm mist humidifier
Unplug your humidifier and let it cool.
Before cleaning your humidifier, be sure to unplug it from the wall. If it's been running, let the humidifier cool down until it is completely cool to the touch.

Select from: 1). Remove all detachable parts from your humidifier. Gently remove any detachable parts of your humidifier for cleaning, so you can better access the water reservoir inside. 2). After that, you can use a diffuser to cool the humidifier down slowly but surely. Most owners opt to let the humidifier cool down for a few hours prior to cleaning, if you work in a warmer climate. 3). Remove and reattach the humidifier to the circuit. Once you've let the humidifier cool down completely, remove it from the circuit. 4). Remove and refill your humidifier. You can find a small pipe cleaner in your machine.
The answer is:
1).