Window Cleaning in the Rain – Why It Still works

If you’re searching for professional window cleaning in Corby, Kettering, Rothwell, Desborough, Market Harborough or Thrapston you may wonder whether it’s worth having your windows cleaned when it’s raining.

At Oakley Window Cleaning, we regularly clean windows in the rain  — and thanks to modern pure water window cleaning systems, the results are just as good as on a dry day.

Does Rain Make Windows Dirty?

No — rain does not make clean windows dirty.

Rainwater is naturally low in minerals, which means it dries without leaving streaks or spots on the glass. The belief that rain causes dirty windows comes from older cleaning methods that used soap or detergent, which left residue behind alongside operatives working from ladders that are more dangerous when the floors wet and slippery. 

With today’s pure water technology, that’s no longer an issue.

The Science Behind Pure Water Window Cleaning

We clean windows using a professional pure water, water-fed pole system, which removes all impurities from the water before it touches your glass.

Here’s how the water quality compares in our local area:

 • Tap water in our area: over 300 ppm TDS

 • Typical rainwater: around 14 ppm TDS

 • Our pure water: less than 10 ppm TDS

Because our water is pure similarly to rainwater, it dries naturally and leaves spot-free, streak-free windows.

Why Rain Doesn’t Affect Window Cleaning Results

When windows are cleaned properly with pure water:

 • There is no soap residue

 • Rain simply runs off the glass

 • No minerals left when rain dries

 • Windows stay cleaner for longer

This means window cleaning in the rain is perfectly safe and effective.

Should You Cancel Window Cleaning Because of Rain?

In most cases, no.

We continue window cleaning in rain across:

 • Corby

 • Kettering

 • Rothwell

 • Desborough

 • Thrapston

 • Market Harborough

We only reschedule appointments if conditions are unsafe, such as high winds or storms — not because of rain alone.