What you need

• Screwdrivers (at least a Phillips-head)
• Dust mask
• Earmuffs (recommended)
• Air compressor
• Angle nozzle air blow gun
• A garage, lab or open space easy to ventilate

What to do

1. Shutdown and unplug the PC from the electricity supply and remove the computer case
2. Unplug the power cable from PSU and clean the cable sheat with a dust cloth
3. Remove the Power Supply Unit using a Phillips-head screwdriver and holding the PSU firmly to avoid to damage motherboard and other components
4. Wear a dust mask and eventually earmuffs
5. Power on the air compressor to clean the PSU fan, cables and connector
6. If there are additional aeration holes clean them with short blows until you’ll see the internal components shine
7. Clean the external chassis of the PSU with a dust cloth and then insert the PSU back into the computer case keeping it firmly when you tighten the screws