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

How to clean a laptop keyboard
Start by turning your machine off.
Unplug it, disconnect it and remove any usb wires or memory sticks.
For simple cleaning, tilt your laptop forward.

pick from the following.
[i] You want the back of your laptop facing up. Hold it up, or think of it as folding a t-shirt into a cone, or a bow..
[ii] This will force the cables and the keyboard to move closer together. Once the cables and keyboard are touching, push down on the keyboard joystick to straighten out the cables..
[iii] Point it towards the back of your desk. Remember, this is the part of the hard drive away from the main power source..
[iv] Bang the back and hopefully anything lodged between the keys will fall out! Take the end of a teaspoon and wrap it in a wet-wipe. Drag the teaspoon along all the edges of the keys and keyboard..
The answer is:
[iv]