Clean windows make a bigger difference than most people realise. They let in more light, improve your home’s street appeal, and simply make a space feel fresher. But anyone who has tackled a full window clean at home knows the frustration: you work through half a bottle of cleaner, use a whole roll of paper towel, and still end up with streaks.

The good news? Getting a streak-free result is not complicated. It comes down to the right tools, the right solution, and a technique that actually works. Whether you are cleaning a studio apartment or a large family home in Sydney, this guide covers everything you need to know.

1. The Right Tools for the Job

The single biggest factor separating a streak-free clean from a smeared mess is your equipment. Most DIY attempts fail because people reach for whatever is under the sink. A quality squeegee and the right cloth make the process faster and the results noticeably better.

Tool	Why You Need It	What to Avoid
Squeegee (30-35cm)	Pulls water cleanly off the glass in a single motion, preventing the solution from drying and leaving residue	Cheap rubber that splits or rolls; replace the blade regularly
Microfibre cloths	Lint-free, highly absorbent, ideal for edges and detail work	Paper towel (leaves fibres), newspaper (ink transfer on modern glass)
Scrubber or applicator	Applies solution evenly across the glass before squeegeeing	Kitchen sponges with abrasive backing
Bucket (10L+)	Enough volume to dilute your solution properly and rinse the scrubber	Small bowls that force you to overload the solution
Extension pole	Essential for upper-floor windows and large picture windows	Leaning ladders against frames, which can crack or scratch
Small detailing brush	Gets into corners and along the rubber seals where a squeegee can’t reach	Any bristle brush with hard or stiff fibres

2. Choosing Your Cleaning Solution

There is a lot of conflicting advice on this. Vinegar, dish soap, store-bought glass cleaner, pure water. Here is the practical breakdown:

DIY Solution (Works Well for Most Windows)

Mix two cups of water, half a cup of white vinegar, and a quarter teaspoon of dish soap. This cuts through grime, grease, and light mineral deposits without leaving a soapy film. The vinegar also helps with hard water marks common in Sydney’s water supply.

Pure Water Cleaning

Professional window cleaners often use purified or deionised water fed through a water-fed pole system. When water has no mineral content, it evaporates clean with zero spotting. This is the same method Shimmer Glass and Pressure Cleaning uses for residential and commercial cleans across Sydney. It is especially effective on large windows and difficult-to-reach panes.

Store-Bought Glass Cleaners

Products like Windex or Selleys Glass Cleaner work well for a quick spot clean but are less efficient on a full window. They dry quickly in warm weather, which can cause streaking before you have time to squeegee the pane properly.

3. Step-by-Step Window Cleaning Method

This is the sequence that professional window cleaners use. Follow it in order and you will get a clean result every time.

• 1
  Pick the right conditions

  Never clean windows in direct sunlight. The solution evaporates before you can remove it, leaving streaks baked onto the glass. Choose an overcast day, or clean in the early morning before the sun hits the panes.

• 2
  Dust and brush the frames first

  Use a dry cloth or small brush to remove loose dirt from the window frame, sill, and rubber seals. If this step is skipped, the dust mixes with your cleaning solution and smears across the glass.

• 3
  Wet the glass fully

  Using your scrubber or applicator, apply your cleaning solution generously across the entire pane. Work from top to bottom. Make sure the glass is fully wet before picking up the squeegee.

• 4
  Squeegee from top to bottom

  Start at the top corner and work in overlapping horizontal strokes, wiping the squeegee blade clean on a cloth after each pass. Finish with a vertical stroke down each edge to catch drips. The professional “S-stroke” technique (a continuous S-shaped motion without lifting the squeegee) is the fastest method on large panes.

• 5
  Detail the edges

  Use a dry microfibre cloth to wipe any remaining moisture along the edges, corners, and sill. A clean cotton ear bud works well for tight corners where the cloth can’t reach.

• 6
  Check from multiple angles

  Step back and look at the glass from an angle in the light. Any remaining streaks or spots will show up clearly. A quick buff with a dry microfibre cloth will take care of any remaining marks.

4. Inside vs Outside Windows

Interior and exterior windows get dirty for very different reasons, and the approach for each is slightly different.

Interior Windows

Inside panes typically accumulate a combination of airborne dust, cooking fumes, pet dander, and fingerprints. This type of film is generally light and responds well to a standard cleaning solution. The most important rule for interiors is to avoid spraying cleaner directly on the glass. Instead, apply it to your cloth or scrubber and then work the pane. This prevents excess liquid running into the window frame and causing damage or mould over time.

Exterior Windows

Outside glass deals with considerably more. Sydney’s coastal and urban conditions mean exterior windows accumulate salt deposits, traffic grime, bird droppings, water marks from sprinklers, and general weathering. For homes near the water, like those in Dover Heights, Manly, or the Eastern Suburbs, salt spray is a constant factor that accelerates the rate of build-up on the glass.

Exterior cleans typically require more pressure, more solution, and more passes before squeegeeing. For windows above the ground floor, a water-fed pole system or professional equipment is the safer and more effective option.

5. Common Mistakes That Cause Streaks

Most streaky windows are not the result of bad products. They are the result of avoidable technique errors.

6. Different Glass Types and Surfaces

Standard Float Glass

The most common type in Australian homes. Responds well to standard cleaning methods and solutions. No special precautions needed beyond the steps above.

Tinted or Coated Glass

Many modern double-glazed units and energy-efficient windows have low-emissivity (low-e) coatings or tints applied to the glass surface. These coatings are delicate. Avoid abrasive scrubbers, razor blades, or acidic solutions like straight undiluted vinegar, which can degrade the coating over time. Use a soft applicator and a pH-neutral cleaning solution.

Frosted or Textured Glass

Frosted glass traps dirt in its surface texture. A standard squeegee will not reach into the texture effectively. A soft-bristle brush or scrubber applied in circular motions before rinsing tends to give the best result. For heavy build-up, a professional clean using specialised equipment is the safest option.

Heritage or Leadlight Windows

These require careful handling. Harsh chemicals and pressure can damage the lead came (the metal strips holding the glass together) or cause the panels to flex. Use a very mild solution applied with a soft cloth, and never use a squeegee with pressure on leadlight panels.

7. How Often Should You Clean Your Windows?

The honest answer: more often than most homeowners do. Here is a practical guide based on property type and location.

Property Type / Location	Recommended Frequency	Reason
Standard residential, no exposure	Every 6 months	General dust and grime build-up
Near the coast (salt exposure)	Every 2-3 months	Salt spray accelerates film build-up and can etch glass if left
Near a main road or construction	Every 2-3 months	Traffic pollution and dust deposits heavily on exterior panes
Properties with large trees nearby	Every 3-4 months	Pollen, sap, and leaf matter stain glass quickly
Commercial properties	Monthly to quarterly	First impressions matter; high foot traffic areas need consistent presentation
Interior windows (residential)	Every 6-12 months	Less exposure, slower build-up unless near cooking areas or pets

8. When to Call a Professional Window Cleaner

DIY window cleaning works well for ground-floor windows on a manageable home. But there are situations where attempting it yourself creates unnecessary risk, produces poor results, or can actually damage your glass.

Safety is the primary reason

Falls from ladders during window cleaning are one of the more common causes of serious home injuries. For any window above ground floor, particularly on multi-storey homes in Sydney’s hillside and cliff-line suburbs, professional equipment and training is not a luxury. It is the sensible choice.

Situations where a professional clean is the better option:

• Two-storey or multi-level properties
• Large picture windows, full-height glazing, or curtain walls
• Heavy mineral deposit, salt, or hard water staining that DIY methods cannot shift
• Post-construction cleaning (paint overspray, silicone, adhesive residue)
• Strata, commercial, and investment properties where presentation is critical
• Any situation involving specialty glass coatings you don’t want to damage
• Heritage or leadlight glass

9. Frequently Asked Questions