Shut down the PC
Unplug the power cable
Disconnect all peripherals
Move the PC to a well-ventilated area
Open the case
Ground yourself to prevent static discharge
Use compressed air to blow out dust
Hold fan blades in place while cleaning
Clean heatsinks, fans, filters, and vents
Use a soft brush for stubborn dust
Wipe surfaces with a microfiber cloth
Clean dust filters separately
Reassemble the case
Reconnect cables
Power on the PC