Aluminium window frames are a staple in New Zealand homes — durable, low-maintenance, and well-suited to our varied climate. With a little regular care, you can keep them looking sharp, prevent corrosion, and extend the life of your joinery significantly. Here's everything you need to know to do it yourself safely and effectively.
What You'll Need
Before you start, gather these basic supplies:
- Soft cloths or microfibre towels
- A soft-bristle brush (an old toothbrush works well for tracks)
- Mild dish soap or a dedicated aluminium cleaner
- A bucket of warm water
- White vinegar (for light oxidation or mineral deposits)
- Silicone-based lubricant spray
- A dry cloth for buffing
- Safety glasses if working overhead
Avoid steel wool, abrasive scourers, or harsh chemical cleaners — these can scratch the anodised or powder-coated finish on your frames and cause long-term damage.
Step-by-Step Cleaning Guide
1. Remove Loose Dirt First
Use a dry soft brush or vacuum with a brush attachment to remove loose dust, cobwebs, and debris from the frame surface and window tracks. This prevents grit from scratching the finish when you apply water.
2. Wash the Frames
Mix a small amount of mild dish soap into a bucket of warm water. Dip a soft cloth into the solution, wring it out well, and wipe down all frame surfaces — top, sides, and sill. Work from top to bottom so dirty water doesn't drip onto areas you've already cleaned.
For stubborn grime or mould, a diluted solution of white vinegar and water (roughly 1:1) can help lift deposits without damaging the finish. Rinse thoroughly with clean water afterwards.
3. Clean the Tracks
Window tracks collect a surprising amount of dirt, dead insects, and moisture — especially in coastal or high-humidity areas of NZ. Use a soft brush or old toothbrush to scrub the tracks, then wipe clean with a damp cloth. Keeping tracks clear helps your windows slide and seal properly.
4. Rinse and Dry
Rinse all surfaces with clean water to remove any soap residue, then dry with a clean cloth. Leaving soap residue can attract more dirt and, over time, dull the finish.
5. Lubricate Moving Parts
Once the tracks and hinges are clean and dry, apply a silicone-based lubricant to the tracks, rollers, and hinges. Avoid petroleum-based products like WD-40 as a long-term lubricant — they can attract dust and degrade rubber seals over time. A silicone spray is available from most hardware stores including Bunnings and Mitre 10.
Dealing with Oxidation and Staining
In coastal areas of New Zealand — think Auckland's North Shore, Wellington's south coast, or anywhere near the sea — aluminium frames can develop a dull, chalky white oxidation or salt deposits. This is a natural reaction to the environment.
For light oxidation, a paste of baking soda and water applied gently with a soft cloth can help restore some shine. For more significant oxidation on powder-coated frames, a specialist aluminium cleaner or polish (available at hardware stores) may be needed. Always test any product on a small, hidden area first.
If your frames have heavy pitting or corrosion, this may indicate the protective coating has failed — see the section below on when to call a professional.
Inspecting and Maintaining Seals and Weatherstripping
While you're cleaning, take the opportunity to inspect the rubber seals and weatherstripping around your frames. These are critical for keeping out draughts, moisture, and noise — all important factors under the Healthy Homes standards for rental properties, and good practice for any NZ home.
Look for:
- Cracking, shrinking, or hardening rubber
- Gaps where the seal no longer contacts the frame or glass
- Mould growing in or around the seal
Worn seals can often be replaced by a competent DIYer — replacement weatherstrip is available at hardware stores. However, if the seal is bonded to the glazing unit or involves the glass itself, contact a glazier.
How Often Should You Clean Aluminium Frames?
| Location | Recommended Frequency |
|---|---|
| Inland / sheltered | Every 3–6 months |
| Urban / moderate exposure | Every 2–3 months |
| Coastal or high humidity | Monthly or every 6 weeks |
New Zealand's coastal climate can be particularly harsh on exterior joinery. BRANZ recommends more frequent maintenance for homes within 500 metres of the coast.
Protecting the Finish Long-Term
After cleaning, you can apply a car wax or dedicated aluminium protectant to powder-coated frames to add a layer of protection against UV and moisture. Buff it off with a clean cloth. This is especially worthwhile on north- and west-facing frames that get the most sun exposure.
When to Call a Professional
Some issues go beyond routine maintenance and need a qualified glazier or window joiner:
- Fogged or condensation between double-glazed panes — this means the sealed unit has failed and needs replacing
- Cracked or broken glass — glass replacement is best left to a licensed glazier for safety reasons
- Frames that are warped, corroded through, or no longer close properly — this may affect your home's weathertightness, which is covered under NZ Building Code clause E2 (External Moisture)
- Significant mould behind frames or on walls — this could indicate a moisture ingress problem requiring professional assessment
- Any work involving structural changes to window openings — this is likely to require a building consent; always check with your local council first, and refer to MBIE Building Performance for guidance on consent requirements
For glass replacement or joinery repairs, you can find qualified local glaziers on tradedirectory.co.nz.
Window & Glass Association
