White staining on cladding panels

White staining on cladding panels: cause, treatment and prevention
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Noticing white patches or streaks on your building’s cladding? This is most likely efflorescence—a common issue on industrial and logistics properties with concrete or masonry elements. Fortunately, it can be effectively treated—if you know the root cause.
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What causes white staining?

White staining appears when salts or lime particles within masonry or concrete dissolve due to moisture (rain, condensation, etc.). These particles migrate to the surface, where they dry and remain visible as a white residue.
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There are two main types:

• Salt efflorescence (typically temporary): often fades naturally as salt is water-soluble.
• Lime efflorescence (more persistent): binds more firmly to the surface and requires professional cleaning.
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How does SkyClean remove white staining?

At SkyClean, we always start by identifying the type of efflorescence before selecting the appropriate treatment method:

• Salt-based stains: may disappear naturally or with gentle surface cleaning.
• Lime-based stains: require mineral washing or power cleaning, depending on the façade material and severity.
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Our techniques are tailored to industrial-scale buildings—where large façades and sensitive surfaces demand precision, low-pressure equipment, and the right cleaning agents to prevent damage.
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Prevention: façade impregnation makes the difference

After cleaning, we strongly recommend impregnating the façade. This protective treatment reduces moisture absorption, helping prevent salts or lime from reaching the surface. While efflorescence can never be fully avoided, impregnation significantly lowers the risk of recurrence.
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Dealing with white staining on your façade?
Let SkyClean inspect and treat it professionally. Contact us for a no-obligation site survey.

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