Calima Dust and Your Windows: Why Costa del Sol Glass Gets Dirty So Fast

What is the calima?

The calima is a mass of fine dust carried north from the Sahara on southerly winds. On the Costa del Sol it can turn the sky orange and leave a thin red film on cars, terraces, solar panels and — of course — windows.

Why calima is so bad for glass

Calima dust is extremely fine and slightly abrasive. When it lands on glass and mixes with overnight humidity, it dries into a bonded film rather than a loose layer of dust. That’s why a rain shower after a calima often makes windows look worse, not better — it simply spreads the dust into streaks.

The hidden cost: your solar panels

Calima doesn’t only affect windows. A dusty solar array can lose 15–45% of its output during a bad spell. If you have panels, cleaning them after the calima usually pays for itself in recovered production — more on our solar panel cleaning page.

How to deal with calima film

• Don’t scrub it dry — the abrasive dust can micro-scratch glass.
• Rinse first, then clean — a professional pure-water system lifts the film without scratching.
• Act quickly — fresh film comes off far more easily than film left to bake in the sun for weeks.

Book a post-calima clean

After a big calima, slots fill fast. Send photos on WhatsApp for a fixed quote and we’ll get your glass — and panels — back to clear. Get your quote here.