How to Keep Your Eavestroughs & Fascia Looking Like New

Stained, streaked eavestroughs and fascia boards are one of the most visible signs of a neglected exterior — and one of the most commonly overlooked. Most Ontario homeowners know to clean their windows and pressure wash their driveways, but the exterior surfaces of their eavestroughs and fascia boards quietly accumulate years of oxidation, black streaks, algae, and grime. This guide covers everything you need to know about keeping these surfaces looking their best.

What Is Exterior Eavestrough & Fascia Cleaning?

It's important to clarify what this service is — and what it isn't. Exterior eavestrough and fascia cleaning refers to cleaning the outside surfaces of your eavestroughs and fascia boards. This is a cosmetic and protective service focused on removing staining, oxidation, algae, mould, and grime from the visible exterior surfaces.

This is different from cleaning out the interior of eavestroughs (removing leaves, debris, and blockages from inside the trough). BTG Exteriors specializes in the exterior cleaning of these surfaces — restoring their appearance and protecting the surface finish.

What Causes Those Black Streaks on Eavestroughs?

If you've noticed dark vertical streaks running down the face of your eavestroughs, you're not alone. These are commonly called "tiger stripes" and they're one of the most common exterior staining issues on Ontario homes. They're caused by a combination of:

• Oxidation: The surface material of aluminum eavestroughs naturally oxidizes over time, creating a chalky residue that bonds with airborne particles.
• Electrostatic bonding: Airborne particles — pollution, pollen, mould spores, and dust — electrostatically bond to the oxidized surface, creating those distinctive dark streaks.
• Algae and mould: Ontario's humid climate encourages biological growth on exterior surfaces, particularly on the shaded north-facing sides of homes.
• General environmental grime: Road grime, tree sap, and general atmospheric soiling accumulate on all exterior surfaces over time.

The good news is that all of these stains can be effectively removed with the right cleaning chemistry and technique — without damaging the eavestrough surface.

Why Does Exterior Eavestrough Cleaning Matter?

Beyond the obvious curb appeal benefit, there are practical reasons to keep the exterior of your eavestroughs and fascia clean:

• Surface protection: Oxidation and biological growth, if left untreated for years, can permanently etch into eavestrough surfaces and degrade the finish of fascia boards. Regular cleaning prevents this.
• Fascia board preservation: Fascia boards — particularly wood or composite wood — are vulnerable to moisture damage. Algae and mould growth on fascia surfaces can accelerate deterioration if not addressed.
• Home value: The exterior appearance of your home directly affects its perceived value. Clean, bright eavestroughs and fascia signal a well-maintained property to potential buyers and visitors.
• Complete exterior presentation: Clean windows and a freshly washed house are undermined by stained, streaky eavestroughs. A truly clean exterior requires attention to all surfaces.

How Often Should Eavestrough & Fascia Exteriors Be Cleaned in Ontario?

For most Ontario homes, we recommend exterior eavestrough and fascia cleaning every 1–2 years. However, several factors may indicate more frequent cleaning is beneficial:

• Homes with heavy tree coverage (increased biological growth and sap deposits)
• Properties near busy roads (higher atmospheric pollution and grime)
• North-facing eavestrough runs (less sun exposure, more biological growth)
• Homes in areas with high humidity or frequent rainfall
• Properties where curb appeal is a priority (real estate listings, rental properties)

The most practical approach is to schedule exterior eavestrough and fascia cleaning as part of a broader annual or biennial exterior cleaning package — combining it with window cleaning, house washing, and siding cleaning for maximum impact and efficiency.

What to Expect from Professional Exterior Eavestrough Cleaning

When BTG Exteriors cleans the exterior of your eavestroughs and fascia, here's what the process looks like:

• Inspection: We assess the type and extent of staining to select the right cleaning approach and chemistry.
• Pre-treatment: A professional-grade, biodegradable cleaning solution is applied to the exterior surfaces and allowed to dwell, breaking down oxidation, stains, and biological growth.
• Gentle agitation: Where needed, soft brushes are used to loosen stubborn staining without scratching the surface.
• Low-pressure rinse: All loosened staining and cleaning solution is rinsed away with low-pressure water.
• Detail and touch-up: We inspect the results and address any remaining spots for a consistent finish.
• Site clean-up: Surrounding surfaces are rinsed down, leaving your property spotless.

DIY vs. Professional Exterior Eavestrough Cleaning

Tiger stripes and oxidation stains are notoriously resistant to household cleaners. Many homeowners attempt to scrub them with dish soap or all-purpose cleaners and find that the stains barely budge — or worse, they use abrasive scrubbers that scratch the eavestrough surface, making it more prone to future staining.

Professional exterior eavestrough cleaning uses specialized chemistry formulated specifically for oxidation and biological staining on eavestrough surfaces. The results are dramatically better than DIY attempts, and the process is safe for all eavestrough and fascia materials — aluminum, vinyl, steel, copper, wood, and composite.

Additionally, cleaning eavestroughs requires working at height on a ladder — a task that carries real safety risks. BTG Exteriors' Netasha Yokom is Working at Heights certified and fully insured, so every job is completed safely and professionally.

Related Services from BTG Exteriors

Exterior eavestrough and fascia cleaning is most effective when combined with other exterior cleaning services for a complete home refresh. BTG Exteriors offers all of the following services throughout Hamilton and Dundas:

• Eavestrough & Fascia Cleaning — Professional exterior cleaning of eavestrough and fascia surfaces throughout Hamilton, Dundas, Burlington, and Oakville.
• House Washing — Soft wash exterior cleaning for all siding types, perfectly complementing eavestrough cleaning.
• Residential Window Cleaning — Complete the exterior refresh with crystal-clear windows.
• Siding Cleaning — Remove algae, mould, and grime from all exterior siding surfaces.

Frequently Asked Questions

What are the black streaks on my eavestroughs?

The black streaks on eavestroughs are commonly called "tiger stripes." They are caused by a combination of oxidation of the eavestrough surface and electrostatic bonding of airborne particles including pollution, pollen, mould spores, and dust. They can be effectively removed with professional-grade cleaning chemistry.

How often should eavestrough exteriors be cleaned in Ontario?

For most Ontario homes, exterior eavestrough and fascia cleaning every 1–2 years is recommended. Homes with heavy tree coverage, near busy roads, or with north-facing eavestrough runs may benefit from annual cleaning.

Can I clean eavestrough tiger stripes myself?

Tiger stripes are notoriously resistant to household cleaners. Professional exterior eavestrough cleaning uses specialized chemistry formulated specifically for oxidation and biological staining. DIY attempts with household products typically deliver poor results and can scratch the surface.

Does BTG Exteriors clean eavestrough exteriors in Hamilton and Dundas?

Yes. BTG Exteriors provides professional exterior eavestrough and fascia cleaning throughout Hamilton, Dundas, Burlington, Oakville, Stoney Creek, Grimsby, and Ancaster. Contact us for a free quote.