Your fascias and soffits sit at the roofline of your home, exposed to rain, wind, sun, and every type of weather the British climate can throw at them. Over time, they accumulate dirt, algae, mould, and green staining that can make even a well-maintained property look tired and neglected. Regular cleaning keeps your roofline looking fresh, protects the material from long-term damage, and can even help you spot problems before they become expensive repairs.

Many properties across South East London and Kent benefit from combined gutter and fascia cleaning — it makes sense to address both at the same time, especially when working at height. Here is everything you need to know.

Why Do Fascias and Soffits Need Cleaning?

Several factors contribute to the build-up of dirt and biological growth on your roofline:

Algae and green staining — the north-facing sides of most homes develop green algae quickly due to reduced sunlight and higher moisture levels
Black mould — particularly common in areas with high humidity or where overhanging trees create shade and trap moisture
Atmospheric dirt — road dust, pollution, and airborne particles settle on horizontal and vertical surfaces alike
Gutter overflow staining — when gutters overflow, dirty water runs down the fascia board, leaving dark streaks and accelerating biological growth
Bird droppings — both unsightly and corrosive, bird droppings can permanently stain uPVC if left in place

Left unchecked, this build-up does more than look bad. Algae and mould can gradually degrade uPVC surfaces, and persistent moisture can accelerate rot in timber fascias. Properties in tree-lined streets across Beckenham, Chislehurst, Petts Wood, and Sevenoaks are particularly susceptible.

Cleaning Methods

Hand Cleaning with uPVC Cleaner

The gentlest and safest method for uPVC fascias. A dedicated uPVC cleaning solution (available from most DIY shops) is applied with a soft cloth or non-abrasive sponge and wiped clean. This method works well for light soiling and regular maintenance but can be time-consuming for heavy build-up or whole-house cleans.

For a DIY approach, warm soapy water with a small amount of washing-up liquid works for general dirt. For green algae, a uPVC-specific cleaner is more effective. Always test a small area first.

Soft Wash Cleaning

Soft washing uses low-pressure water combined with specialist cleaning solutions that kill algae, mould, and lichen at the root. The cleaning agent is applied, left to dwell for a short period, and then rinsed off at low pressure. This method is highly effective and safe for all types of uPVC, cladding, and painted surfaces.

Soft washing is our preferred method for fascia and soffit cleaning across Kent and South East London. It delivers excellent results without the risk of high-pressure damage.

Pressure Washing (with Care)

A pressure washer can speed up the cleaning process significantly, but it must be used with caution on roofline surfaces. A wide fan nozzle at moderate pressure (no more than 100 bar) held at a reasonable distance is acceptable for sturdy uPVC fascias. However, pressure washing carries risks:

High pressure can force water behind fascia boards and into the roof structure
Direct jets can crack or distort thin uPVC soffits
Painted surfaces can be stripped by excessive pressure
Water can be driven under roof tiles, causing interior leaks

What NOT to Use on Fascias and Soffits

Certain cleaning products and methods should be avoided entirely:

Household bleach — while it kills algae, bleach can discolour uPVC and damage the plasticiser that keeps it flexible. Over time, bleach-treated uPVC becomes brittle and chalky
Abrasive pads or wire brushes — these scratch the smooth surface of uPVC, creating a rough texture that attracts dirt and algae even faster
High-pressure jets at close range — as noted above, direct high-pressure jets can cause physical damage and water ingress
Solvent-based cleaners — some solvents dissolve or soften uPVC. Always use a cleaner specifically designed for uPVC

Top tip: If you are cleaning fascias yourself, work on a dry, overcast day. Direct sunlight causes cleaning solution to dry too quickly, leaving streaks and residue.

How Much Does Professional Fascia Cleaning Cost?

Professional fascia and soffit cleaning costs vary depending on the size and accessibility of your property:

Small terraced house: £100 to £150
Semi-detached house: £150 to £250
Detached house: £200 to £350
Large or complex properties: £350+

Many homeowners choose to have their fascias cleaned at the same time as their gutter cleaning, which is more cost-effective than booking two separate visits. We offer combined gutter and roofline cleaning packages across all our service areas.

How Often Should You Clean Fascias and Soffits?

As a general guide:

Every one to two years for most properties — this keeps build-up manageable and maintains a clean appearance
Annually for properties in shaded or tree-heavy locations — areas like Paddock Wood, Pembury, and the wooded suburbs around Bromley tend to develop green staining more quickly
Every two to three years for south-facing properties in open locations — these dry faster and accumulate less biological growth

Signs of Damage to Watch for While Cleaning

Cleaning your fascias is also an opportunity to inspect them for damage. Watch for these warning signs:

Peeling paint on timber fascias — indicates moisture penetration and potential rot underneath
Soft or spongy areas — press gently on timber fascias; any softness means rot has set in
Warped or buckled uPVC — usually caused by heat exposure or incorrect installation
Gaps between fascia and wall — allows water and pests to enter the roof space
Cracked or missing soffit vents — essential for roof ventilation; damaged vents should be replaced promptly
Nesting evidence — birds and wasps often nest behind fascias and in soffit voids

If you spot any of these issues, our guide to fascia board types and replacement covers the next steps. For properties needing repair or replacement, visit our fascia and soffit services page.

DIY vs Professional Cleaning

Cleaning fascias and soffits yourself is feasible for single-storey homes where you can reach the roofline safely with a step ladder or telescopic brush. For two-storey and taller properties, we strongly recommend professional cleaning for several reasons:

Working at height on ladders carries significant risk, especially when handling cleaning equipment
Professional equipment (including reach-and-wash poles and soft wash systems) delivers better results without ladder work
Professional cleaners can spot early signs of damage that homeowners might miss
Combined gutter and fascia cleaning is more economical than separate visits

Book a Fascia and Soffit Clean

At Gutter Maintenance Tech Ltd, we clean fascias and soffits on properties of all sizes across Kent, Sussex, and South East London. Whether your home is a Victorian terrace in Lewisham, a 1930s semi in Bromley, or a modern detached house in Tonbridge, we have the equipment and experience to restore your roofline. We are SafeContractor approved, fully insured, and backed by 150+ five-star reviews.

Call 0204 541 7121 (London) or 01892 337966 (Kent) for a free quote, or visit our fascia and soffit services page to learn more.

How to Clean Fascias and Soffits: Methods, Costs and Tips