How to clean your PC. — 30 minutes. 8-15°C cooler. No drama.

How often to clean — set the rhythm

There's no universal answer because dust loads vary enormously by environment. A PC in an open-plan Sandton apartment with carpeted floors and two cats accumulates dust much faster than the same PC in a tiled Cape Town flat with HEPA filtration.

As a general rule:

• Every 2-3 months — Highveld dust environments (Pretoria, Centurion, parts of Johannesburg), carpeted rooms, homes with pets, dusty industrial neighbourhoods.
• Every 3-4 months — typical SA suburban environment, tiled floors, occasional cleaning.
• Every 6 months — coastal homes with regular wet-vac cleaning, air-conditioned rooms with filtration, low-pet households.

The "feel" check is just as reliable as a calendar. If you can see dust on the top of the case or through the side panel, or if your fans have gotten audibly louder under the same gaming load, it's time. CPU and GPU idle temperatures rising 5-10°C over baseline is another reliable signal.

A 5-minute "quick clean" of the front dust filter and the GPU fan area every 4-6 weeks dramatically reduces how often a full clean is needed. Make it a habit when you do your monthly Windows updates.

Tools you actually need

The shopping list is short and most of it lasts years.

The single biggest upgrade in cleaning tools is moving from canned compressed air to an electric blower. A R650 Xpower A-2 or similar pays itself off after about five cleans and produces dramatically more airflow without the propellant frostbite risk that canned air carries.

Prep & safety — before you open the case

Shut down the PC. Fully shutdown — not sleep, not hibernate. Wait until the case lights are completely off.

Unplug the power cable from the wall. Don't trust the rear PSU switch alone. Press the PC's front power button once to drain any residual capacitor charge.

Move the PC to a workable spot. Outside on a patio or in a garage is ideal — you don't want to redistribute the dust around your living room. A folded old sheet on a clean table catches falling debris.

Ground yourself. Touch a bare metal part of the case before reaching inside. If you have an anti-static wrist strap, clip it now. The static risk on dry SA winter days is genuine — your body can hold 5,000-15,000 volts of static charge, more than enough to damage RAM or NVMe.

Take photos with your phone before disconnecting anything. Cable routing, fan orientation, RGB header positions — a quick photo saves 30 minutes of confusion on reassembly.

Step-by-step — the 30-minute basic clean

1. 01

   Remove side panels & filters

   Both side panels, plus the front and top magnetic dust filters. Take them outside. (2 min)
2. 02

   Clean the filters

   Tap out heavy dust, then blow through with compressed air. If filthy, rinse with warm water and dish soap; dry 24 hours. (5 min)
3. 03

   Blow out the case interior

   From top to bottom. Hold the case at an angle so dust falls outward, not deeper inside. (5 min)
4. 04

   Clean every fan

   Hold each blade still with a finger or brush. Blow from the side opposite to the airflow direction. (5 min)
5. 05

   Heatsink & radiator fins

   Blow lengthwise through the fins. For embedded dust, an anti-static brush helps dislodge it before blowing. (5 min)
6. 06

   GPU shroud & PSU intake

   Blow GPU fans (holding blades still) and the PSU intake grille from outside the case. (3 min)
7. 07

   Wipe panels & tempered glass

   Microfibre cloth on glass (slightly damp with IPA for fingerprints). Brush metal panels first if dusty. (3 min)
8. 08

   Reassemble & power test

   Filters back in, panels reseated, power on. Verify all fans spin within 30 seconds of boot. (2 min)

Total time: 30 minutes for a clean done right, less once you've done it a few times.

Dust filters in detail

Modern cases — Fractal Design, Lian Li, NZXT, Corsair, Phanteks — have magnetic dust filters that pop off in seconds. They're the single most important hygiene component because they trap most of the dust before it reaches the internals.

Light dust: tap on the side of the bin, then blow through with compressed air. Done.

Heavy dust (typical SA Highveld): rinse with warm water and a single drop of dish soap. Run lukewarm water through until clear. Pat dry with a clean towel, then air-dry for at least 24 hours. Never reinstall a damp filter — moisture inside the case causes far worse problems than a few extra dust particles.

Old / yellowed filters on cases 3+ years old often get permanently dust-stained. They still function but never look factory-fresh again. Replacement mesh filters (Demciflex, custom-cut DustEnd) are available for popular cases in SA and last 5+ years.

If your case lacks built-in dust filters (older or budget cases), a roll of adhesive PC filter mesh from Takealot or Yuppiechef makes a R200 upgrade that pays itself off in cooling improvements within weeks.

Heatsink, radiator, AIO & pump care

CPU heatsinks and AIO radiators are dust magnets. Their fin density (5-25 fins per inch) traps everything that gets past your filters, and they're the hardest part to clean back to factory-fresh.

For air coolers (Noctua NH-D15, Deepcool AK620, Arctic Freezer 36): remove the fans first (4-6 screws or push-clips), then blow compressed air lengthwise through the fin stack from both directions. An anti-static brush helps dislodge dust trapped between fins before blowing.

For AIO radiators (Arctic Liquid Freezer III, NZXT Kraken, Corsair iCUE): identical approach — remove fans, blow through fins both directions. The pump unit itself doesn't need cleaning beyond a wipe-down of the housing.

Do NOT open or service a sealed AIO. The coolant inside is engineered for the closed loop and topping it up with water destroys the pump. If your AIO is leaking, making coil-whine noises from the pump, or pump-failing, the entire unit needs replacement.

Custom open-loop systems need full coolant drain, fitting inspection, and fluid replacement every 12-18 months. That's a dedicated process beyond standard dust removal and requires draining tools, fresh coolant, and good case prep.

In the 200,000+ custom builds we've shipped from Centurion and the thousands brought in for cleaning service yearly, the average customer's PC has reached 22°C of accumulated thermal debt by the time they bring it in — most of which traces to dust-clogged radiator fins and GPU heatsinks. A proper 30-minute clean recovers virtually all of it. The PCs that come back regularly for every-6-month preventative cleans never see this drift in the first place and last visibly longer before component upgrades become necessary.

Behind the Build · From the Centurion bench

When to also replace thermal paste

Most cleans don't require repasting. Modern quality paste (Arctic MX-6, Thermal Grizzly Kryonaut, Noctua NT-H2) lasts 3-5 years comfortably. Don't repaste annually as a routine — it's unnecessary work and a small risk of CPU socket damage on each remount.

Repaste when:

• It's been 3+ years since the last application.
• CPU temps have crept 8-15°C above baseline even after a thorough dust clean.
• You've removed the cooler for any reason during cleaning (always — never reuse spread paste).
• The paste is visibly dry, cracked, or has migrated off the centre of the IHS.

The repaste procedure — remove cooler, clean both surfaces with 99% IPA on a lint-free cloth, apply a pea-sized dot of new paste in the centre of the IHS, remount the cooler with even tension. See our dedicated thermal paste guide for the full walkthrough.

When to replace fans (not just clean them)

Fans don't last forever. Quality case fans (Noctua, be quiet!, Arctic, Fractal Aspect) carry 6-7 year MTBF ratings. Cheap fans (no-name OEM, very budget bundled fans) often start to fail after 2-3 years.

Signs a fan needs replacement, not cleaning:

• Rattling, grinding or buzzing noises at startup or under any RPM — bearing failure.
• The fan no longer spins freely when nudged by hand (with power off and a clean blade) — bearing seizure.
• Fan stops or restarts intermittently at the same RPM — motor coil or controller failure.
• Visible blade damage — cracks, missing chunks, warped blades.

A quality 120mm replacement fan in SA costs R250-R700 depending on tier (Arctic P12 PWM around R280; Noctua NF-A12x25 around R650). Replacing a dying fan now prevents the rest of the case running hotter trying to compensate.

South African dust reality

SA has notably challenging conditions for PC longevity, and pretending otherwise leads to disappointment.

Highveld dust — fine, dry, abundant. Pretoria, Centurion, parts of Johannesburg and the East Rand have substantial outdoor dust loads that infiltrate even sealed buildings. PCs in these areas need more frequent cleaning and benefit massively from positive case pressure (more intake CFM than exhaust) so all incoming air passes through filters.

Coastal salt air — Durban, Cape Town, East London. Salt corrodes contacts and connectors over years. Sealed cases with dehumidifying gel packs in tower-style PCs sitting on the floor offer a measurable lifespan advantage. Avoid placing PCs directly under open coastal-facing windows.

Bushveld pet hair — homes with dogs and cats (combined with carpeted floors) generate enormous hair burdens. PC dust filters clog within 4-6 weeks in these environments. Front filter shake-outs every 2-3 weeks dramatically extend full-clean intervals.

Karoo & rural dust storms — fine ochre dust gets into everything during dust-storm season. Sealing the PC under an inverted box during known storm days, or moving to a sealed cabinet, is a sensible defence in affected areas.

Key takeaways

1. Clean every 3-4 months in SA conditions; every 2-3 months for Highveld dust environments.
2. Compressed air or electric blower only — never use a vacuum (static damage risk).
3. Always hold fan blades still while blowing — free-spinning fans can damage motherboard headers.
4. 30 minutes for a complete clean; expect an 8-15°C temperature drop on dust-clogged systems.
5. Only repaste during cleans if 3+ years have passed or temps are still high after dust removal.

Frequently asked questions