You can use a hair dryer to clean it, but you need to disassemble the computer. There is a special hair dryer, you can go to the computer repair place to have a look. Of course, it is ok to have a hair dryer at home. Pay attention to using cold air.
3. Pay attention to the place where the fan is cleaned. The dust accumulated in the fan is easy to produce noise, which affects the heat dissipation of the computer. You can use a brush.
4. Dust on the surface of main cabinet and monitor can be cleaned by computer.