Cleaning UPVC fascias and soffits is one of the more accessible exterior jobs a homeowner can tackle, but it's also one where a wobbly ladder against a gutter causes more accidents each year than the cleaning itself ever needed to. Get the method right and it's a straightforward job with a satisfying result.
Here's how to clean fascias and soffits properly, what to use, where the real risk lies, and when the access difficulty tips the job over to being one for a professional instead.
What actually gets fascias and soffits dirty
Grey-black streaking on fascias is usually a mix of algae, airborne pollution, and mould feeding on dust, worse under overhanging trees or on north-facing elevations that stay damp longer. Soffits, the underside panels, often collect cobwebs, wasp nest residue, and grime blown up from the roof edge.
None of this is difficult to shift chemically. A warm water and mild detergent solution handles most grime, while a diluted UPVC-safe cleaner or a light biocide solution deals with algae staining that soap alone won't touch. North-facing elevations and sections shaded by neighbouring trees or extensions almost always need attention first, since they simply don't get the drying sunlight that keeps south-facing fascias cleaner for longer.
Method for cleaning safely
Work with a soft-bristled brush on an extension pole where possible rather than climbing a ladder for every section, applying the cleaning solution, agitating gently, and rinsing with a hose or low-pressure spray before it dries. Avoid abrasive pads and anything containing bleach used neat, since both can dull the UPVC's factory finish over time.
If ladder access is unavoidable, use a proper stepladder or extension ladder on firm, level ground, never resting it on the guttering itself, and have someone footing it. This is exactly the point where DIY jobs go wrong: reaching too far sideways instead of moving the ladder is one of the most common causes of falls in exterior cleaning.
Why pros use different access kit
Professional cleaners typically use water-fed poles reaching third and fourth-storey height from the ground, meaning no ladder contact with the property at all. For fascias and soffits specifically, that means the whole run gets cleaned evenly from a stable footing, without the leaning and stretching that causes both accidents and streaky, missed patches.
This access method also makes it far easier to spot problems early, cracked or warped fascia boards, loose brackets, or the first signs of a gutter starting to sag, since the technician has a clear, steady view of the whole run rather than a series of awkward glimpses from different ladder positions.
Costs and when to call a professional
DIY costs little beyond a cleaning solution and pole, but professional fascia and soffit cleaning typically costs around £80-£150 for an average semi, often bundled with a gutter clean or roof clean since the access equipment is already up. If your property is dormer-style, has a steep pitch, or fascias above a conservatory roof you can't safely reach, that's a clear sign to call a professional rather than improvise.
Two-storey Victorian terraces and taller detached properties, both common across the North East, often push fascia height beyond what a domestic ladder can safely reach anyway, which is usually the deciding factor for most homeowners weighing up DIY against calling in a professional.
Frequently asked questions
Related guides
Get Your Free Quote!
Enter your details below and one of our experts will be in touch to discuss the work needed and give you your free no-obligation quote.