Fly screens are the single most underestimated part of window cleaning. Most customers think they're an easy add-on. They're not — they're often the most physically difficult part of a residential clean. And it's the part where the gap between proper professionals and corner-cutters becomes most obvious.
This guide covers what fly screens actually do, why they get so dirty, how they should be cleaned, and what to watch out for if you're getting quotes.
For pricing, see the fly screen cleaning cost guide.
What Fly Screens Actually Do
Most people think of fly screens as bug barriers and nothing else. They do far more than that:
Filter incoming air. Every time you open a window, the air drawn into the house passes through the fly screen first. The screen catches dust, pollen, smoke particles and other airborne debris before they enter the room. In Melbourne — particularly during summer when westerlies carry dust from across Bass Strait — this is more significant than people realise.
Block direct sun glare. A fly screen reduces direct sunlight by 5–15% depending on the mesh density. Once a screen is dirty, that figure climbs significantly because the accumulated dust and pollen acts as an additional filter layer.
Add privacy. During the day, fly screens make it harder to see clearly through windows from outside, providing visual privacy without blinds.
Protect glass from impact. Screens absorb the impact of small flying debris, hail, and birds — minor protection but real.
The flip side: all of this means screens accumulate dirt faster than any other window component. They're literally designed to catch things.
Why Fly Screens Get So Dirty
Three reasons.
They're outside year-round. Unlike windows, which most people clean at least occasionally, fly screens sit exposed to weather for years between professional cleans. They catch every speck of dust, every grain of pollen, every layer of fine atmospheric grime.
They're vertical mesh, not flat glass. Glass is easy to wash because dirt sits on a smooth surface and runs off with water. Mesh has thousands of tiny intersection points where dirt physically embeds and stays put. Rain doesn't actually wash fly screens — it just rearranges the dirt.
They're often forgotten in DIY cleaning. When homeowners clean windows themselves, they almost universally skip fly screens. Years of accumulation builds up undisturbed.
The result: by the time a professional cleans them, fly screens often hold years of layered grime — far more than what's on the glass behind them.
How Fly Screens Should Be Cleaned (The Proper Method)
Every screen should go through this process:
Step 1: Removal
Each screen is taken out of the window frame. This sounds straightforward but is often the hardest part of the job. Screens are usually clipped or tabbed into a frame painted at the same time as the surrounding architrave. Years later, paint has often partially bonded the screen to the frame. Removing it without chipping the paint takes care and the right technique.
A common Melbourne complication: in many homes, blinds were installed after the fly screens, so the blind brackets sit in front of the screen edge. The only way to remove the screen is to take the blinds off, remove the brackets, then access the screen. This adds significant time but is the only way to do the job properly.
Step 2: Lay Flat
The screen is laid flat on a soft surface so both sides can be accessed simultaneously. Flat is important — trying to scrub a screen while it's vertical pushes water and dirt back into the mesh from the opposite side.
Step 3: Wet Down
A detergent solution is applied to both sides. The detergent breaks down the dust and pollen that's bonded into the mesh intersections.
Step 4: Scrub
A soft brush — not a hard brush, which damages the mesh and stretches it over time — is worked across both sides in a consistent direction. The brush mechanically dislodges debris that the detergent has loosened.
Step 5: Rinse
This is the step most cheap operators skip and it matters more than people realise. Rinsing with clean water flushes the loosened dirt and detergent residue out of the mesh. Without proper rinsing, the screen dries with detergent residue still in the mesh, which attracts dust and looks dull. The rinse continues until the run-off water is clear.
Step 6: Dry
Enough surface drying to handle the screen without water dripping inside the house.
Step 7: Re-Fit
The screen is re-installed into the frame in the correct orientation. Screens have a correct orientation — the tabs and clips engage in specific positions. Re-fitted upside down or with the wrong tabs engaged, they don't sit flush and gap at the edges.
The whole process takes 5–10 minutes per screen done properly, sometimes longer for screens behind blinds that need to be partially dismantled.
What Cheap Operators Do Instead
Across the jobs I've taken over from previous cleaners, the corner-cutting on fly screens is consistent:
The "wave a wet cloth over it" method. The screen stays in the frame. A wet cloth or wet brush gets dragged over the surface while it's vertical. This pushes water and dirt onto the windowsill behind it, doesn't actually clean the mesh in any meaningful way, and leaves visible streaks running down the wall below the window.
The "include in quote, skip on the day" method. Some operators include "fly screens" in their quote, then in practice just give them a token wipe and call it done. The customer doesn't know the difference until much later when light and airflow haven't improved.
The damage-and-don't-mention-it method. Removal done badly chips paint around screen frames. A proper cleaner will mention any damage they cause or find. Cheap operators often don't.
The wrong re-fit method. Screens re-installed with the wrong tabs engaged or upside down create gaps at the edges that bugs come straight through. The screen looks installed but isn't doing its job.
The quick test: ask any cleaner whether they remove fly screens to wash them or wash them in place. If the answer is "in place," the screens aren't being properly cleaned.
What Properly Cleaned Fly Screens Look Like
Three changes you'll notice immediately after a proper fly screen clean:
The room gets brighter. Direct light coming through clean mesh is dramatically brighter than light filtered through years of dust. Rooms that always felt dim suddenly feel light-filled, particularly north and east-facing rooms.
Airflow improves. Clean mesh has open intersections. Years of accumulated dust partially blocks them, restricting airflow. After a proper clean, opening a window for ventilation actually moves air the way it should.
The view through the window changes. A clean window behind a dirty screen still looks dull from inside. The screen visually overlays the glass. Once both are clean, looking out feels like looking through nothing.
These aren't subtle differences. Most customers comment on the light improvement before they comment on the windows themselves.
How Often Fly Screens Need Cleaning
Cleaner pattern by suburb type:
- Bayside foreshore properties: Salt residue accumulates fast. Fly screens here need cleaning at least every 6 months, ideally every 3 months for properties within a few streets of the bay.
- Inland Glen Eira and Stonnington: Annual fly screen cleans are usually enough. Some customers do them with every 6-monthly window clean, which is overkill but harmless.
- Properties under heavy tree cover: Pollen and tree debris build up faster, so 6-monthly cleans are worthwhile.
- Properties facing main roads: Vehicle dust and pollution accumulates more rapidly, so 6-monthly cleans are worth it.
For most Melbourne homes, doing fly screens once a year as part of a full clean strikes the right balance. They don't need cleaning every visit.
Common Fly Screen Problems I See on Jobs
A few patterns worth knowing about, because they affect how a job runs:
Old aluminium frames with tired mesh. Mesh has a lifespan — usually 15–20 years before it starts to fail. Old screens often have small holes, sagging mesh or corroded frames that can't be properly cleaned because the mesh tears under any pressure. These need replacement, not cleaning.
Painted-over screens. When houses get repainted, screens are sometimes painted over by mistake. The paint bonds the screen to the frame and makes removal impossible without damage. If this has happened, the screen needs to be replaced.
Magnetic strip screens. Some modern screens use magnetic strips instead of clips. These are easier to remove but harder to keep aligned during re-fit.
Pleated retractable screens. These don't come out for cleaning — they're cleaned in place with a vacuum and a damp cloth. Different process entirely. Worth flagging if you have these.
Crimsafe and security screens. These are heavier and built for security rather than just bug protection. Cleaning them properly takes longer because of the denser mesh, and removal is sometimes restricted by the locking mechanism. Quoted separately when present.
Fly Screen Cleaning as Part of a Full Service
For most residential cleans, fly screen cleaning is the natural add-on alongside the windows. Done at the same time, the marginal time and cost is small relative to the difference it makes to the overall result.
Fly screens are also the part that customers notice the most after the job. Clean glass is expected — it's why they booked the service. Brighter rooms and better airflow from clean screens is the unexpected benefit that gets remembered.
Get Your Quote With Fly Screens Included
Instant quote calculator — fixed price in 60 seconds, with fly screen options built into the booking flow.
For pricing specifics see the fly screen cleaning cost guide.
For the complete picture across all Melbourne window cleaning costs, see the pricing guide.