Expert Aggregate Pressure Washing in Surrey and the Lower Mainland
Exposed aggregate surfaces are among the most attractive and durable hardscape options available to homeowners and business owners across the Lower Mainland. The decorative stone finish adds character and texture to driveways, patios, pool decks, walkways, and entryways. However, the very texture that makes exposed aggregate so visually appealing also makes it a magnet for dirt, moss, algae, lichen, and organic debris. The recessed pockets between stones trap contaminants that regular garden hose rinsing simply cannot reach, and over time your once-beautiful aggregate surface becomes discoloured, slippery, and diminished in appearance. Shine City Pressure Washing specializes in restoring exposed aggregate surfaces throughout Surrey, Delta, Langley, White Rock, and the entire Fraser Valley. Call (604) 229-5354 or request a free quote online to bring your aggregate back to life.
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Updated for 2026: Concrete and aggregate surface cleaning is a top priority for 2026 in Metro Vancouver. The region’s wet winters drive deep biological staining into porous concrete, and 2026 sees growing demand for professional hot-water cleaning that lifts oil, moss, and efflorescence without damaging sealed or stamped finishes. Our updated 2026 process uses surface cleaners that deliver even, streak-free results on every concrete type.
Why Exposed Aggregate Requires Professional Cleaning
Exposed aggregate concrete features a deliberately roughened surface where decorative stones, pebbles, and gravel are visible above the cement matrix. This textured profile creates hundreds of tiny valleys, crevices, and depressions per square foot — each one a potential trap for organic matter, mineral deposits, and biological organisms. In the Lower Mainland’s wet climate, where annual rainfall exceeds 1,500 millimetres in many areas, these micro-traps stay perpetually damp for months at a time, creating ideal incubation conditions for moss, algae, mould, and lichen.
Standard pressure washing by inexperienced operators can actually damage exposed aggregate. Too much pressure dislodges individual stones from the cement matrix, permanently roughening the surface and accelerating future contamination. Too little pressure fails to reach contaminants embedded between and beneath the exposed stones, leaving the surface looking patchy and incompletely cleaned. Professional aggregate washing requires the right combination of cleaning solutions, pressure calibration, and technique to thoroughly clean every crevice without compromising the structural integrity of the surface.
The consequences of neglecting aggregate maintenance extend beyond appearance. Moss and algae growth on aggregate surfaces creates a dangerously slippery walking surface, particularly when wet. For homeowners, this represents a liability risk for family members and visitors. For businesses and strata complexes, it creates genuine legal exposure if someone slips and falls on a poorly maintained surface. Regular professional cleaning eliminates these biological hazards and keeps your aggregate surfaces both beautiful and safe.
Our Aggregate Cleaning Process
Detailed Surface Inspection
We begin every aggregate cleaning project with a careful inspection of the surface. Our technicians examine the type of aggregate used, the condition of the cement matrix, the extent and type of contamination, and any areas of existing damage or weakness. Different aggregate mixes — from river rock and quartz to granite and limestone — respond differently to cleaning solutions and pressure levels, so this assessment directly informs our approach. We also identify areas where sealant may be worn or absent, cracks that need attention, and drainage patterns that may be contributing to excessive moisture retention.
Pre-Treatment Application
Before any pressure is applied, we treat the entire surface with a professional-grade cleaning solution formulated specifically for textured concrete and aggregate. This solution penetrates deep into the crevices between exposed stones, breaking down organic growth, mineral deposits, and embedded contaminants at the root level. The pre-treatment is particularly important for moss removal — moss sends fine root structures called rhizoids deep into the cement matrix, and simply blasting the surface growth away with pressure leaves these roots intact to regenerate within weeks. Our pre-treatment kills moss completely, roots and all, ensuring a lasting clean.
Calibrated Pressure Washing
We use commercial-grade surface cleaning equipment specifically calibrated for exposed aggregate. Our pressure settings are selected based on the age, condition, and aggregate type of your surface — typically operating at a pressure that is strong enough to flush contaminants from between the stones but gentle enough to avoid dislodging aggregate or eroding the cement matrix. Our rotating surface cleaners provide uniform coverage without the streaking and wand marks that handheld washing can leave on textured surfaces. For larger areas like commercial walkways and strata common areas, we deploy industrial equipment that maintains consistent cleaning quality across extensive square footage.
Detail Work and Edge Cleaning
After the primary surface clean, our technicians perform targeted detail work along edges, against walls and foundations, around drain grates, and in corners where the surface cleaner cannot reach. These transitions and boundaries often harbour the heaviest concentrations of moss and organic buildup, and thorough edge cleaning makes the difference between a good result and a great one. We also clean any expansion joints, control joints, and cracks where biological growth tends to concentrate.
Final Rinse and Quality Check
A comprehensive final rinse removes all loosened debris and cleaning residue from the surface. We then inspect the entire area under natural light to confirm uniform cleanliness and address any remaining spots. The transformation is typically dramatic — aggregate surfaces that appeared grey, green, or nearly black emerge with their original stone colours fully visible and vibrant.
Types of Aggregate Surfaces We Restore
Driveways and Vehicle Pads
Exposed aggregate driveways are extremely popular across Surrey, Langley, and Delta. They combine the durability needed for vehicle traffic with an attractive decorative finish that complements virtually any architectural style. However, oil drips, tire marks, moss, and years of accumulated grime can transform a stunning aggregate driveway into an eyesore. Our cleaning process restores the full colour range of the decorative stones and removes every trace of contamination from between and around the aggregate.
Patios and Outdoor Living Spaces
Aggregate patios are gathering spaces for family and friends, and they deserve to look their best. Food and beverage spills, barbecue grease, leaf staining, and biological growth all contribute to patio contamination over the years. We clean aggregate patios with particular attention to stain removal and biological hazard elimination, leaving you with a clean, safe, and inviting outdoor living space.
Pool Decks and Surrounds
Aggregate pool decks present unique cleaning challenges. The combination of constant moisture, chlorinated water splash, sunscreen residue, and organic debris from surrounding landscaping creates a complex contamination profile. Algae growth on pool decks is particularly dangerous because the surface is designed for bare feet. Our cleaning addresses all of these contaminants while using solutions that are safe for use near pool water and will not alter your pool chemistry.
Commercial Walkways and Entryways
Businesses across the Lower Mainland use exposed aggregate for walkways, entryways, courtyards, and common areas because of its attractive appearance and slip-resistant texture when properly maintained. We clean commercial aggregate surfaces for retail centres, office complexes, strata properties, restaurants, and public facilities, delivering results that enhance your business’s professional image and maintain safe walking surfaces for employees and customers.
Stairways and Stepped Surfaces
Aggregate stairs and stepped surfaces are common in the Lower Mainland’s hilly terrain, connecting different levels of residential and commercial properties. These surfaces are particularly hazardous when contaminated with biological growth, as the combination of slope and slippery surface creates extreme fall risk. We clean aggregate stairs with the same care and thoroughness as flat surfaces, ensuring every tread and riser is free of moss, algae, and other slip hazards.
Aggregate Sealing After Cleaning
After professional cleaning, many property owners choose to have their aggregate sealed. While Shine City focuses on the cleaning and preparation phase, we strongly recommend sealing as a follow-up step performed by a qualified concrete contractor. A quality penetrating sealer fills the micro-pores in the cement matrix, dramatically reducing moisture absorption and making the surface far more resistant to future staining, biological growth, and freeze-thaw damage. Sealed aggregate is also significantly easier to maintain between professional cleanings — regular sweeping and occasional hose rinsing are usually sufficient to keep a sealed surface looking excellent for two to three years between professional washes.
There are two primary sealer types to consider. Penetrating sealers absorb into the concrete matrix without changing the surface appearance, providing invisible protection that does not alter the natural look or texture of your aggregate. Film-forming sealers create a visible surface coating that enhances stone colours and provides a subtle sheen, giving the aggregate a permanent wet-look appearance that many homeowners find attractive. Your concrete contractor can advise on the best option for your specific aggregate type and aesthetic preferences.
The Lower Mainland Climate Challenge
The Lower Mainland’s climate creates a uniquely hostile environment for exposed aggregate surfaces. Rainfall that exceeds 1,500 millimetres annually in many areas keeps surfaces perpetually damp during the wet season, while mild winter temperatures rarely get cold enough to kill biological organisms. This means moss, algae, and lichen enjoy nearly year-round growing conditions, unlike colder regions where winter freezes provide a natural biological reset. The result is that aggregate surfaces in the Lower Mainland accumulate biological growth faster and more persistently than almost anywhere else in Canada, making regular professional maintenance not just advisable but essential for preserving both appearance and structural integrity.
Frequently Asked Questions
How often should exposed aggregate be professionally cleaned?
In the Lower Mainland’s climate, we recommend professional aggregate cleaning once per year for most residential properties. Surfaces in heavily shaded areas, near large trees, or with poor drainage may benefit from cleaning every eight to ten months. Commercial properties with heavy foot traffic should consider semi-annual cleaning to maintain both appearance and safety standards.
Will pressure washing loosen the stones in my aggregate?
Not when performed correctly. Our technicians are specifically trained in aggregate cleaning techniques, and we calibrate our equipment to clean thoroughly without exceeding the pressure threshold that could dislodge stones. Surfaces that are already in poor condition — with loose stones or deteriorated cement — are assessed individually, and we adjust our approach accordingly or advise the property owner if the surface needs repair before cleaning is advisable.
Can you remove black lichen spots from aggregate?
Yes. Black lichen is one of the most stubborn biological contaminants on aggregate surfaces, and it resists standard pressure washing because its root structure penetrates deeply into the cement matrix. Our pre-treatment solution is specifically formulated to kill lichen at the root, and the subsequent pressure wash removes all visible traces. For extremely heavy lichen infestations that have been present for years, a second treatment may be recommended to ensure complete eradication.
What is the difference between aggregate cleaning and concrete cleaning?
The fundamental difference is in the surface texture and the approach required. Smooth concrete can tolerate higher pressure and more aggressive cleaning techniques because there are no protruding stones to dislodge. Aggregate requires more carefully calibrated pressure, greater reliance on chemical pre-treatment, and specialized technique to clean the recessed areas between stones without damaging the surface profile. We treat aggregate cleaning as a specialty service that demands specific training and equipment beyond standard concrete washing.
Do you serve areas outside Surrey?
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- Vancouver Pressure Washing — Complete exterior cleaning for Metro Vancouver
Absolutely. Shine City provides aggregate pressure washing across the entire Lower Mainland, including Delta, Langley, White Rock, Abbotsford, Maple Ridge, Coquitlam, New Westminster, Burnaby, Vancouver, and the North Shore. Contact us at (604) 229-5354 for a free estimate on your aggregate cleaning project.
Ready for a cleaner property? Reach Shine City at (604) 229-5354 or get your free quote. We’d love to hear from you!