How can I clean my computer?
Here are the steps to safely clean your computer:

First, read the manufacturer's recommended cleaning instructions first. Follow all instructions and safety advisories.

Gather the cleaning supplies you'll need:
1. Soft lint-free (microfiber) cloth
2. Small soft-bristled brush
3. Isopropyl Alcohol (Ethyl Alcohol will work as well)
4. Lint-free or non-woven paper towels
Optional: Compressed air can or vacuum with a narrow nozzle attachment; you may also want to use gloves, eye protection and a face mask to avoid getting dust in your eyes, nose and mouth.

Follow these steps and be sure to be careful with the delicate electronics in your computer:
1. Shutdown the computer and be sure to save any work or progress you have in running applications.
2. Unplug the computer from it's power source. If the computer uses a battery like a laptop, follow the manufacturer's instructions for removing the battery safely.
3. Carefully remove any large dust build-up with your hands or the compressed air/vacuum.
4. If you find some of the debris in or on your computer doesn't not easily brush away, use put a drop of alcohol on a paper towel and gently scrub the area.
5. Use the paper towels and alcohol to clean your keyboard, mouse and any other peripherals that may need to be cleaned.
6. Finally, use the microfiber cloth to gently wipe up any residue and remaining dust.
7. Plug your computer back in and enjoy it until the next time you decide to clean it.

I hope that helps, and have a great day.
Yes there's plenty of choices for me to try, thanks for your help.

One more question, which of the above supplies are safe to clean my monitor?
The safest way to clean a monitor is to use a soft microfiber cloth and distilled or still water. Other types of water or cleaning products can damage the screen or leave residues13. Here are the steps to follow:

1. Turn off the monitor and the computer, and then disconnect the power cables.
2. Using a clean microfiber cloth, gently wipe the monitor’s screen to remove dust and fingerprints.
3. Dampen the cloth with a small amount of distilled water. **Do not spray water directly onto the screen, as this can cause water damage.**
4. Gently wipe the monitor with the dampened microfiber cloth. Do not apply too much pressure or scrub the screen, as this can scratch or damage it.

When you are finished, allow the monitor to dry and then reconnect the power cables.

Sources:
1. https://www.samsung.com/us/support/answer/ANS00086622/
2. https://www.pcgamer.com/how-to-clean-your-pc-monitor/
3. https://www.pcguide.com/monitor/how-to/clean-screen/