There’s a lot to be said about making first impressions count. And if you have a commercial building that has a high visitor footfall or is prominently positioned, its exterior is the first thing people see of you and your business. But when you see your building every day, you might not spot the little things: a few streaks on the panels, a patch of green starting to creep along the edges, or the way the surface doesn’t quite shine like it used to. But those small changes are often your building’s way of telling you it needs some TLC and professional cladding cleaning.

When you need cladding cleaning services the most

Unfortunately, cladding doesn’t stay clean and spotless forever. Weather and pollution might be the biggest factors of grime build-up, but bird mess, organic growth, and staining, especially in coastal areas around Devon, Cornwall, and much of the south west, will also leave their mark, no matter how new or well-designed your property is.

But while it’s tempting to think a quick rinse might sort it all out, professional cladding cleaning services can make all the difference between a façade that looks dirty and tired and one that looks brand new again. Here are five clear signs that it’s time to call in the experts.

1. Visible dirt, staining, or discolouration

The most obvious sign that your cladding needs cleaning is visible dirt, staining, or discolouration. Over time, traffic pollution, dust, and 24/7 weather exposure will cause unsightly marks that make your building’s exterior lose its lustre, and these are the most common causes:

Traffic pollution: Carbon deposits, exhaust fumes, and even grease can all build up to leave a dark, grimy coating, especially near busy roads. 
Water streaks: Bad drainage or rainwater can leave white mineral deposits and streaks on metal or glass panels. 
Organic growth: Algae, moss, and mould love damp or shaded areas and will quickly grow, leaving green or black areas on surfaces.

If all these are left untreated, they won’t just affect the building’s appearance, they’ll lead to surface corrosion, erode any protective coatings, or cause permanent discolouration. Professional cladding cleaning techniques, like soft washing or DOFF steam cleaning (depending on the cladding type), will shift these contaminants safely and restore the cladding’s original look.

2. Dull or faded surfaces

Building cladding is made to be hard-wearing and bring an exceptional finish. But UV rays, pollution, and bad weather can fade finishes, making metallic or coloured panels look dull. Very few (if any) claddings are immune to this, and once the surface loses its sheen, it can also lose its protective qualities, making it more inclined to corrode or degrade. Other than its look, here’s why dull or fading surfaces matter:

Reputation killer: A dull and faded façade can send the wrong message to workers, visitors, and potential clients. 
Coating loss: Any faded surfaces can be a definite sign that coatings or treatments might not be giving the protection needed. 
Cleaning difficulty: The longer any fading goes untreated, the more difficult it becomes to clean and restore to the original finish.

Soft wash cladding cleaning will clear dirt and stains while restoring faded materials back, as close as possible, to their original colour. Making cladding cleaning a regular and consistent event will make sure your building keeps its professional finish all year round.

3. Corrosion, rust, or surface damage

Metal and composite cladding systems, especially on industrial sites or in coastal areas in Devon and Cornwall, could be more likely to corrode. Rust stains or chalky white residue on aluminium, steel, or other metal cladding panels often mean that contaminants are eating into the surface. This can result in some of the following:

Rust streaks or spotting beneath joints or fixings
Chalky residue (oxidation) on aluminium or coated panels
Bubbling or flaking paint on treated metal surfaces

These issues can get worse quickly if they’re ignored, and could compromise the building’s structure and weatherproofing. Specialist cladding cleaning services can remove the contaminants that cause corrosion and put a stop to further damage to coatings or finishes.

4. Organic and biological growth

Algae, moss, fungus, and mould growth aren’t just things that look bad, they’re a sign that moisture is being trapped. If it’s left unchecked, these biological contaminants can spread, degrade paintwork, damage render, and create health risks, especially near ventilation systems or walkways. Key things to look out for include:

Green or black patches on north-facing or damp, shaded façades
Dank, musty odours or dark streaks underneath windows or vents
Slippery walkways near cladding base panels

To gently remove organic growth without harming building materials or the surrounding environment, soft washing is the preferred cleaning technique. Using low-pressure water and a biocide treatment, this method helps prevent regrowth, keeping cladding surfaces cleaner for longer and reducing your ongoing maintenance needs.

5. Water run-off and bad drainage

Whatever their material, most cladding systems have hidden gutters, joints, and seals built in to control the flow of rainwater. Over time, these can all be damaged or blocked by dirt, leaves, moss, or other debris. And when drainage stops working properly, rainwater will run down the face of the cladding. When this happens, this is what you could see:

Water streaks or discolouration near panel joints
Damp patches or water marks after rain
Corrosion or mould appearing around seals and fixings

Regular cladding cleaning will clear the dirt and debris blocking or damaging run-off systems, while regular inspections of seals, joints, and panels can ensure your cladding continues to perform as designed, protecting your building whatever the weather.

Does regular cladding cleaning make a difference?

The short answer to this is ‘yes’. Regular cladding cleaning keeps your building looking its best and performing effectively. But how often cleaning is needed depends on your location, the building’s use, and the cladding materials. Here’s what we recommend as a cleaning schedule:

Buildings near busy roads or industrial sites: every 3–6 months
Coastal properties and sites: every 6–12 months
Rural or sheltered properties: every 12–18 months

Having your cleaning schedule planned ahead means any possible issues are caught early, and minor maintenance doesn’t become a major headache.

Protect your building with Prestige Professional

Keeping your building’s cladding in top condition shouldn’t be an afterthought when something goes wrong. Regular professional cladding cleaning services for your property in Devon, Cornwall, or across the South West from Prestige Professional help maintain its appearance, protect cladding materials, and saves you money in the long run.

If you’re seeing any of these five signs on your property, whether you’re in Devon, Cornwall, or anywhere across the South West, it’s time to take action. By scheduling consistent cleaning with us, your building will always make a strong first impression.

Contact our expert team today to arrange a site assessment. For more information on any of our façade and surface cleaning services, send us a message, call 01752 424873 or email info@prestigeprofessional.co.uk.