Use condition and environment
There is no universal cleaning interval for every PC. Inspect external vents and filters according to the manufacturer guidance, especially where dust is visible or behaviour has changed.
Start with safe external care
Shut down, disconnect power and follow the model's cleaning instructions. Keep liquid out of openings. Compressed-air and internal cleaning methods vary; do not copy a demonstration intended for another design.
Separate dust from other faults
New noise, heat or shutdowns can have other causes. Record the workload and warnings before assuming cleaning is enough. A cleaned case does not establish that fans, storage or power components are healthy.
Arrange internal work appropriately
Ask what will be inspected and why opening the device is needed. Internal access should follow service instructions; never open a power supply for cleaning. Agree the scope and cost before work begins.
Questions about this guide
Is there a cleaning interval that suits every PC?
No. Dust exposure, ventilation and the case design vary. Inspect changes in airflow and noise and follow manufacturer guidance rather than booking parts replacement on a fixed calendar.
What should I ask before internal cleaning?
Ask what will be opened, how delicate parts and fans will be handled and whether any thermal material needs replacement. Agree the scope before work begins.