Why Do My Windows Look Streaky After Cleaning?

It's one of the most frustrating homeowner experiences: you spend hours cleaning your windows, only to step back and see a mess of streaks and smears, especially when the Perth sun hits the glass. Sometimes, they can even look worse than when you started.

As professional window cleaners, we understand this frustration. The good news is that it's not your fault—it's usually the tools and the water you're using. Here are the main culprits behind streaky windows and how to achieve a truly professional, flawless finish.

The 3 Main Causes of Streaky Windows

1. Cleaning in Direct Sunlight

In a sunny city like Perth, this is the #1 mistake. When you apply a cleaning solution to hot glass, the water evaporates almost instantly, leaving behind a sticky residue of soap and dirt before you even have a chance to wipe it off. This residue is what causes the majority of streaks.

2. Using Tap Water

Perth's tap water is perfectly safe to drink, but it's full of minerals like calcium and magnesium. When this water dries on your glass, it leaves behind tiny, white mineral deposits. This is the same reason you get white spots on your car after washing it with a hose. These spots create a hazy, unclear finish.

3. Using Too Much Soap (or the Wrong Kind)

Many household cleaners are too soapy. Using too much detergent creates a thick lather that is very difficult to completely remove with a squeegee. The thin film of soap residue left behind is a magnet for dust and grime, causing your windows to look dirty again very quickly.

The Professional Solution: Pure Water Technology

So, how do we guarantee a perfect, streak-free finish every time? We use a state-of-the-art **RO/DI pure water system**.

This system strips out 99.9% of all minerals and impurities from the water. Because this pure water has no mineral content, it dries naturally without leaving a single spot or streak behind. It also acts as a natural cleaning agent, breaking down dirt without the need for harsh, sticky detergents.

This method, combined with professional-grade tools and techniques, is the secret to a flawless finish that not only looks better but also stays cleaner for longer.