Write the next sentence in this paragraph:

How to thoroughly clean your computer 
Remove dust from the interior. 
Turn off the computer and unplug the power cord. Open the computer tower according to the manufacturer's suggestions.

Choose your answer from:
(1). Remove the dust with a rag or paper towel before you store any valuable data. Afterwards, the machine may finally be clean.;
(2). This might involve removing screws or pressing a locked-button mechanism. Use tweezers to remove large clumps of dust or debris.;
(3). Check the wiring or circuit board for missing parts and cables. Look at the back of your computer for replacement parts.;
(4). Lightly remove excess dust with a soft cloth or baby wipe. Run warm water on a small sink or bucket.;
(2).