If you’ve noticed black streaks running down your windows after a clean, especially on aluminium frames, you’re not alone.
Many homeowners across Coleraine and the North Coast experience this issue—and it usually comes down to poor cleaning methods, not the windows themselves.
At TrueClean NI, we specialise in professional window cleaning for both aluminium and uPVC frames, delivering a spotless, streak-free finish every time.
Not all window frames are the same—and using the wrong technique can leave your windows looking worse after they’ve been cleaned.
Modern and stylish—but they require expert care.
Can release black residue during cleaning
Dirt builds up in edges and seals
Need a thorough clean on the edges
👉 Cleaned properly, they look incredible
👉 Cleaned poorly, they leave streaks and marks
Common across homes in Coleraine and surrounding areas.
Easier to maintain
Still hold dirt in frames and vents
Can cause spotting if not rinsed properly using water fed pole method.
Polished by traditional window cleaning will shine brightly.
👉 Simpler to clean—but still needs professional care for best results
This is one of the biggest complaints we hear.
Black streaks are caused by:
Built-up dirt in frames and seals
Oxidation from aluminium frames
Rushed or incomplete rinsing using water fed pole method
Frames being cleaned after the glass
👉 The result? Dirty water runs down onto freshly cleaned windows
Reliable, friendly, local service
Specialists in aluminium & uPVC window cleaning
Streak-free results every time
Regular or one-off cleans available
Serving Coleraine, Portrush, Portstewart & surrounding areas
No more:
❌ Black streaks after cleaning
❌ Water spots drying on your glass
❌ Missed dirt in frames and corners
Just clean, clear, spotless windows—done properly
If your windows aren’t coming up right, it’s time for a better clean.
👉 Contact TrueClean NI today for professional window cleaning in Coleraine and the North Coast.
✔ Fast response
✔ Affordable pricing
✔ Reliable service you can trust
Let’s get your windows looking the way they should—spotless