Write the next sentence in this paragraph:

How to clean a bathroom fan
Turn off the power.
Before you do anything else, ensure that the fan is turned off and cannot turn back on until you are finished cleaning it. Most models will have a plug that is located directly behind the cover.

Choose from: (1). Switch the power off before turning on your fan. Close the curtains to minimize the amount of light that enters the room.. (2). You could remove the cover first and unplug the fan, but just to be safe, go and temporarily pull the breaker for your bathroom. The fan is now safe to work on.. (3). Most fans will only have an auxiliary vent that is located directly behind the cleaner or you may use a webcam. Be careful not to accidentally turn the power off, as your fan may fall into the nasal cavity.. (4). If it is not yet turned off, unplug the power supply and rejack the cover for 30 to 60 seconds, until light comes into the room with the power off. This usually takes about 15 minutes or so..
(2).