How to clean fly screens: 5 quick methods for mesh, frames and rails

By late summer, the insect screens on Swiss windows and balcony doors have done their job for months – and it shows. Pollen, dust, spider webs and dead midges turn the mesh grey and make rooms darker. The good news: it only takes a few simple tools to clean fly screens properly. The best method depends on one question: can you take the screen out, or is it fixed?

Why fly screens get so dirty

They act like a filter. Air flows through, and everything it carries sticks to the fine mesh: pollen in spring, dust from roads and building sites in summer, soot in winter. Near fields or busy roads, the fabric can look noticeably darker after a single season.

Dirty mesh is not just an eyesore. They reduce light and airflow, and the next rain splashes the dirt onto freshly cleaned windows. Cleaning them before autumn, when many people store roller or frame screens for the winter, keeps them in good condition for longer.

Removable or fixed? Know your screen type

Before you start, check how it is mounted. The method depends on it.

If you rent, do not drill, bend or force anything. If a clip or rail seems stuck, leave it and clean in place instead.

1. Remove dust dry with a vacuum brush

This step works for every type and should always come first.

1. Close the window behind it if possible, so dust does not blow inside.
2. Use the soft upholstery or dusting brush attachment on low suction.
3. Vacuum the mesh in straight lines from top to bottom, first on the outside, then on the inside.
4. Go over the frame edges and corners where insects collect.

Low suction matters: a strong vacuum can pull the mesh out of shape.

2. Use a lint roller for fine dust and pollen

A lint roller is a surprisingly effective tool here, especially for fixed and roller models. Roll it gently over the stretched mesh without pressing hard. The adhesive picks up pollen, fine dust and small insects that a vacuum leaves behind. Replace the sheet as soon as it is grey.

3. How to clean fly screens thoroughly: wash them flat

If yours can be taken out, a proper wash removes greasy film and stubborn dirt.

1. Lay it flat on an old towel on the balcony, in the bathtub or on the shower floor.
2. Mix lukewarm water with a small amount of washing-up liquid or soft soap.
3. Brush the mesh gently with a soft brush in both directions.
4. Rinse with a shower head on a gentle setting or with a watering can – never with a high-pressure jet.
5. Shake off excess water and let it dry upright in the shade before putting it back.

To clean fly screens made of fibreglass mesh, avoid solvents and abrasive sponges. Aluminium mesh tolerates more, but also bends more easily.

4. Clean fixed screens with two cloths

For models you cannot remove, use a two-cloth technique after vacuuming:

• Hold a dry microfibre cloth flat behind the mesh as support.
• Wipe the front gently with a well-wrung, damp microfibre cloth and a drop of mild soap.
• Swap sides and repeat, then wipe with a cloth dampened with clear water.

Work in small sections and rinse the damp cloth often. Too much water runs into the rails and leaves streaks on the window below.

5. Don't forget frames, rails and brushes

The mesh is only half the job. Frames, side rails and the brush seals of roller and pleated screens collect sand, leaves and insects, which can cause jamming.

• Vacuum the rails with a crevice nozzle.
• Wipe frames with soapy water and dry them.
• Use a paintbrush or old toothbrush for the brush seals.
• Check that everything runs smoothly; do not oil it unless the manufacturer says so, as oil attracts dust.

If you clean upper-floor windows, safety comes first. Use a stable step ladder with a safety bar instead of a chair – the BFU explains what makes a step ladder safe – and never lean far out of a window. The BFU also warns against acrobatics when cleaning windows.

Common mistakes when cleaning fly screens

• High-pressure cleaners: They stretch the mesh, tear it out of the frame and push dirt into the rails.
• Wetting dusty mesh first: Creates a smeary layer that is harder to remove than the dust was.
• Stiff brushes or scouring pads: Roughen fibreglass mesh and leave visible marks.
• Putting screens back wet: Moisture in the frame and rails can lead to marks and musty smells.
• Forgetting the window: Clean the screen first, then the glass – otherwise dirt drips onto clean windows.

Once the screens are clean, the glass behind them is the next step – our guide to streak-free windows shows how. And if you are preparing to move out, read what applies to cleaning blinds and shutters as a tenant.

Priority Clean editorial teamOur cleaning team from Alberswil, Canton of Lucerne, shares hands-on experience from move-out, house, office and window cleaning across Central and Northwestern Switzerland.