Exterior Cleaning — Master FAQ Hub
Restore & Maintain Your Property’s Exterior
Everything you need to know about NorTech’s exterior cleaning services — from pressure washing and soft washing to roof cleaning, solar panels, gutters, windows, siding, and more.
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Scope of Services
What We Clean
NorTech’s exterior cleaning crews handle every surface on your property — using the right method and the right pressure for each material.
Hard Surfaces
- Driveways & Sidewalks
- Patios & Pool Decks
- Parking Lots & Garage Floors
- Brick & Stone Walkways
- Retaining Walls
- Stucco & Masonry
Structures & Surfaces
- Wood & Composite Decks
- Fences & Pergolas
- Roofs (Shingle, Tile, Metal)
- Vinyl, Wood & Fiber Cement Siding
- Gutters & Downspouts
- Exterior Windows & Frames
Specialty & Commercial
- Solar Panels
- Storefronts & Office Buildings
- Multi-Unit Housing
- Post-Construction Cleanup
- Storm & Emergency Cleaning
- Seasonal Property Prep
General Questions
General Exterior Cleaning FAQs
Methods, safety, scheduling, seasonal timing, and what to expect when you book an exterior cleaning with NorTech.
What’s the difference between pressure washing, power washing, and soft washing?
Pressure washing uses high-pressure water (1,300–3,000+ PSI) to blast away dirt, stains, and buildup from durable surfaces like concrete, stone, and brick. Highly effective but can damage softer materials if misapplied.
Power washing is similar to pressure washing but uses heated water, making it more effective on grease, oil, and sticky substances — ideal for garage floors, driveways with vehicle leaks, and commercial surfaces.
Soft washing uses low-pressure water combined with biodegradable cleaning solutions to gently lift dirt, mold, algae, and stains from delicate surfaces like roofs, siding, wood decking, and stucco — no surface damage risk.
💡 How We Choose
At NorTech we assess each surface before starting and select the safest, most effective method — so you never have to worry about the wrong technique damaging your property.
How often should I schedule exterior cleaning?
For most properties, once or twice a year keeps surfaces clean and prevents buildup from becoming structural damage. That said, frequency varies by surface:
- Driveways & concrete: 1–2 times per year
- Siding & windows: 1–2 times per year
- Gutters: 2–3 times per year (spring, fall, and after major storms)
- Decks & fences: Annually, before re-staining or sealing
- Roofs: Every 2–3 years (annually in humid or shaded environments)
- Solar panels: 2–4 times per year for maximum efficiency
Homes in humid, coastal, or heavily wooded areas typically need more frequent service.
Are your cleaning solutions safe for pets, plants, and landscaping?
Yes. We use biodegradable, eco-friendly cleaning solutions that are tough on organic growth and stains but safe for families, pets, and the environment. Before applying any cleaning agents near landscaping, we pre-soak and protect plants to minimize chemical contact. Pets should be kept indoors during the service as a precaution against high-pressure water.
How do I prepare my property before a cleaning appointment?
- Remove or cover patio furniture, grills, and outdoor decor
- Keep pets indoors and away from work areas
- Close all windows, doors, and vents
- Move vehicles out of the driveway if it’s being cleaned
- Let us know about any fragile landscaping, outdoor lighting, or electrical components near work zones
For roof and solar panel cleaning, we handle all safety setup — you don’t need to do anything extra. If you’re unsure about anything, we’ll walk you through it before the appointment.
Do you offer emergency cleaning after storms or accidents?
Yes. We provide rapid-response cleaning for storm debris, mud intrusion, paint spills, or chemical incidents. Our team prioritizes emergency calls to restore your property quickly and safely. Contact us through the 24/7 emergency line for same-day dispatch.
Can you handle post-construction exterior cleanup?
Yes. We remove concrete splatter, paint overspray, dust, adhesive residue, and construction debris from siding, windows, concrete, and other exterior surfaces after renovation or new construction work. Post-construction cleanup requires specialized technique to avoid scratching or etching surfaces — our crews are trained for it.
Should I schedule exterior cleaning before winter or in spring?
Pre-winter: Removes mold, algae, and debris that traps moisture and can freeze — causing cracking in concrete, lifted shingles, and ice dams in gutters. Critical for properties in freeze-thaw climates.
Spring: Removes salt residue, winter grime, and any mildew that developed over the cold months. Prepares surfaces for entertaining season and helps reveal any winter damage early.
Ideally, do both — a fall and spring clean is the most effective maintenance schedule for year-round protection.
Do you offer bundled or recurring maintenance packages?
Yes. Bundling multiple services in a single visit (e.g., roof + gutters + driveway) saves time and money since the crew and equipment are already on site. We also offer recurring maintenance packages — quarterly, semi-annual, or annual — at discounted rates, so your property stays consistently clean without you needing to remember scheduling.
Do you service commercial properties?
Yes. We service storefronts, office buildings, parking lots, multi-unit housing, and retail spaces. We offer flexible scheduling including early mornings, evenings, and weekends to minimize disruption to business operations. Clean exteriors signal professionalism, attract customers, and protect your investment from long-term surface degradation.
Concrete & Driveways
Concrete & Driveway Cleaning FAQs
Driveways, sidewalks, and patios are some of the most stained surfaces on any property. Here’s what you need to know.
What stains can you remove from concrete?
We remove dirt, grime, mold, algae, rust stains (from irrigation systems or metal furniture), oil and grease, tire marks, paint, and general weathering discoloration. Tough oil and grease spots are treated with heated power washing and specialized degreasers. Rust requires targeted chemical treatments that lift the stain without harming the concrete surface.
Can pressure washing damage my concrete or pavers?
It can — if done incorrectly. Using excessive PSI, wrong nozzle angles, or holding the wand too close can etch, pit, or erode the surface. NorTech technicians are trained to use the correct pressure and technique for each concrete type and age. Older or previously damaged concrete gets special care; pavers and stamped concrete are cleaned at lower pressure to preserve their finish.
How often should I clean my driveway or patio?
At least once per year for most homes. In high-traffic areas, near trees that drop sap or pollen, or where vehicles regularly leak oil, two cleanings per year is recommended. Stains left untreated too long penetrate deeper and become significantly harder to remove.
Should I seal my concrete or pavers after cleaning?
Yes — sealing after a deep clean is one of the best investments you can make for longevity. A quality sealer resists staining, reduces cracking from freeze-thaw cycles, and makes future cleanings easier. Sealer typically lasts 2–3 years on driveways and 3–5 years on patios with light foot traffic. We recommend scheduling the seal within a few days of the cleaning while the surface is fully open and free of contaminants.
Can you clean brick and natural stone surfaces?
Yes. Brick and natural stone require lower pressure and pH-neutral cleaners to avoid etching or mortar erosion. We assess the age and condition of the material before starting — older brick especially benefits from soft washing over high-pressure methods. We also clean efflorescence (white salt mineral deposits) from brick and masonry.
Decks, Fences & Patios
Deck, Fence & Outdoor Structure Cleaning FAQs
Wood, composite, and vinyl outdoor structures need careful cleaning to stay strong, safe, and beautiful.
Do you pressure wash wood decks and fences?
No — high pressure on wood splinters the grain, strips protective finishes, and forces water deep into the wood, accelerating rot. We use soft washing with specialized detergents that lift dirt, mold, algae, and tannin stains without surface damage. For composite decking and vinyl fences, we adjust pressure and chemistry for a thorough but safe clean.
Will cleaning fully remove mold and algae from wood?
Yes. We use treatments that kill mold and algae at the root rather than just wiping the surface — which prevents rapid regrowth. Results depend on how deeply the growth has penetrated, but the vast majority of mold and algae is completely eliminated. After cleaning, sealing or staining the wood locks out moisture and dramatically slows regrowth.
Can cleaning restore a faded, grayed-out deck?
Often, yes — significantly. Graying is mostly surface oxidation and accumulated grime. A proper wash removes years of buildup and reveals the natural wood tone underneath, which can look dramatically better. For full restoration, we also offer wood brightening treatments, staining, and sealing that bring the color and protection back to like-new condition.
Should I clean my deck before repainting or restaining it?
Absolutely — this is non-negotiable for quality results. New stain or paint applied over dirty, moldy, or oxidized wood won’t adhere properly and will peel or bubble within months. Cleaning opens the wood pores and removes all contaminants so the new finish bonds correctly and lasts years longer. Schedule the clean 48–72 hours before your refinishing appointment to allow the wood to fully dry.
Can you clean pergolas, gazebos, and outdoor furniture?
Yes. Pergolas, gazebos, trellises, and large outdoor furniture all accumulate mold, bird droppings, pollen, and weather staining. We clean wood, metal, vinyl, and wicker structures using the appropriate method for each material. Ask about bundling these with your deck or patio cleaning for the most efficient scheduling.
Roof Cleaning
Roof Cleaning FAQs
Moss, algae, and debris silently shorten your roof’s lifespan. Here’s how we address it safely.
Is roof cleaning safe for asphalt shingles?
Yes — when done with soft washing, which is the only method we use on roofs. Soft washing uses low-pressure water and biodegradable cleaning solutions to dissolve and rinse away moss, algae, lichens, and black streaks without stripping the protective granules from shingles. High-pressure washing on a roof is harmful and voids most manufacturer warranties — we never use it.
What are those black streaks on my roof?
Those are Gloeocapsa magma — a cyanobacteria (blue-green algae) that feeds on the limestone filler in asphalt shingles. It spreads by spores carried by wind and leaves dark discoloration that makes roofs look old and neglected. Beyond aesthetics, the algae eats into shingle material, reducing reflectivity and accelerating granule loss. Soft washing eliminates it completely.
Why does moss removal matter beyond appearance?
Moss is far more damaging than it looks. Its root system physically lifts shingle edges, allowing water to penetrate underneath and cause rot, mold, and eventual leaks. Moss also retains moisture against the roof surface, dramatically accelerating material breakdown. Removing moss and treating for regrowth adds years — sometimes a decade or more — to a roof’s functional lifespan.
⚠ Insurance Note
Some homeowner’s insurance policies deny claims for roof damage if the roof shows signs of long-term neglect such as heavy moss or algae growth. Regular cleaning is documented maintenance that protects your coverage.
How often should I clean my roof?
Every 2–3 years for most homes. In humid climates, shaded properties, or areas with heavy tree coverage, annual cleaning is recommended. After cleaning, zinc or copper strip treatments along the ridge can slow algae and moss regrowth between service visits.
Do you clean tile, metal, and flat roofs too?
Yes. Each roof type requires a tailored approach:
- Clay/concrete tile: Soft washing only — tiles are brittle and crack under pressure or foot traffic
- Metal roofs: Low-pressure washing with non-corrosive solutions to remove oxidation and biological growth without scratching coatings
- Flat/TPO/EPDM roofs: Gentle cleaning to remove debris and algae that cause pooling and membrane deterioration
Is it safe for crews to walk on my roof?
Our crews are fully trained in fall protection and use professional harnesses, anchor systems, and ladders on all pitched roofs. We follow OSHA-compliant safety protocols on every job. For tile roofs specifically, we use systems that minimize foot traffic on the tile surface to prevent cracking.
Window Cleaning
Exterior Window Cleaning FAQs
Clean windows let in more light, boost curb appeal, and protect glass from long-term mineral staining.
How do you clean exterior windows — by hand or with equipment?
Both, depending on the situation. For ground-level and easily accessible windows, we use traditional squeegee and scrub techniques for streak-free results. For second-story and higher windows, we use water-fed extension poles with purified (deionized) water — which dries completely spot-free because the minerals that cause spotting have been removed. For very high or hard-to-reach windows, we use professional ladder systems and safety equipment.
Can you remove hard water stains from glass?
Yes. We apply specialized mineral-dissolving solutions that break down calcium and lime deposits without scratching the glass. Results depend on how long the stains have been present — fresh deposits clear completely, while very old etching may leave permanent micro-scratches in the glass surface. In severe cases we can recommend professional glass polishing as a follow-up treatment.
Do you clean frames, sills, and screens?
Yes — our window cleaning service includes wiping down frames and sills as part of the standard service. Screen cleaning (removing, washing, and reinstalling screens) is available as an add-on. Clean screens allow more light through and prevent the fine residue on dirty screens from transferring back onto freshly cleaned glass every time it rains.
How often should exterior windows be cleaned?
At least twice a year for most homes. More frequent cleaning is recommended in areas with heavy pollen, coastal salt air, heavy rainfall, nearby construction, or high dust. Commercial storefronts typically benefit from monthly or quarterly cleaning for professional presentation.
Gutter Cleaning
Gutter Cleaning FAQs
Gutters protect your foundation, roof, and walls from water damage — but only when they’re clear and flowing properly.
How do you clean gutters?
We remove all debris by hand or with vacuum systems, then flush gutters and downspouts with water to confirm clear flow and check for leaks, improper pitch, or separated joints. All waste is bagged and removed from your property — we don’t blow debris onto your lawn or landscaping. We also inspect gutter hangers and end caps and note any concerns in our service report.
What happens if gutters aren’t cleaned regularly?
Clogged gutters are one of the most common — and preventable — causes of serious home damage:
- Overflowing water saturates the soil against your foundation, causing cracks and basement leaks
- Standing water in gutters breeds mosquitoes and causes rust or rot in wood fascia boards
- Ice dams form in winter when clogged gutters prevent proper drainage, backing water under shingles
- Heavy debris causes gutters to pull away from the roofline, requiring expensive repairs
How often should gutters be cleaned?
At minimum, twice a year — once in late spring after tree flowering, and once in late fall after leaves drop. Homes with overhanging trees, pine needles, or heavy seedpods may need 3–4 cleanings per year. We also recommend a post-storm inspection after major wind or rain events that deposit heavy debris.
Do you clean and flush downspouts too?
Yes, always. Downspouts are included in every gutter cleaning — they’re the most critical part of the drainage system and the most common point of blockage. We flush them from top to bottom and, if blocked, use pressurized water or auger tools to clear the clog. Underground downspout extensions are inspected and cleared where accessible.
Should I install gutter guards after cleaning?
Gutter guards reduce — but don’t eliminate — maintenance. Fine mesh guards significantly reduce leaf accumulation, but small debris like pine needles, seeds, and shingle grit still get through and accumulate over time. Guards are worth considering if you have significant tree coverage, but you’ll still need periodic inspection and flushing. We can advise on guard compatibility with your gutter type after the cleaning.
Siding Cleaning
Siding Cleaning FAQs
Siding protects your home’s structure and sets its first impression. Here’s how we clean it without damage.
Can you clean all types of siding?
Yes. We clean all common siding materials:
- Vinyl: Most common — responds very well to soft washing
- Wood & LP SmartSide: Soft washing only to prevent grain damage and water intrusion
- Fiber cement (HardiePlank): Low-pressure with pH-neutral solutions to protect the factory finish
- Stucco: Soft washing to clean without eroding the texture coat
- Brick: Lower pressure, pH-neutral — special care around mortar joints
- Metal/steel: Non-corrosive solutions to remove oxidation and biological growth
Why does siding get green and black streaks?
Green streaks are algae feeding on the moisture and organic particles on the surface. Black streaks are typically mold or the same Gloeocapsa magma bacteria that appears on roofs. Both grow fastest on north-facing or shaded walls where moisture lingers. They’re not just cosmetic — mold and algae hold moisture against siding material, accelerating deterioration and potentially penetrating into wall cavities. Soft washing kills the growth at the root rather than just rinsing the surface.
Can pressure washing damage vinyl or wood siding?
Yes — high pressure on siding can force water behind the panels, leading to moisture damage, rot, and mold inside your walls. It can also crack or dent vinyl, strip paint from wood, and erode stucco texture. This is exactly why we use soft washing for all siding surfaces. The cleaning solution does the work; the water rinses it away at low, safe pressure.
How often should siding be cleaned?
Once a year is the standard recommendation for most homes. Homes in humid climates, near trees, or with north-facing or shaded walls may benefit from twice-yearly cleaning to prevent rapid mold and algae regrowth. Cleaning also makes it much easier to spot siding damage — cracks, gaps, or failing caulk — early, before water gets behind the panels.
Should siding be cleaned before painting?
Without exception. Paint applied over dirty, moldy, or oxidized siding will fail prematurely — peeling, bubbling, and flaking within a season or two. A proper soft wash removes all contaminants so the new paint bonds correctly and achieves its full rated lifespan. Allow 48–72 hours of drying time after cleaning before painting begins.
Solar Panel Cleaning
Solar Panel Cleaning FAQs
Dirty panels lose output — and the losses add up fast. Here’s what keeps your system producing at peak efficiency.
Why do solar panels need professional cleaning?
Even a thin layer of dust, pollen, bird droppings, or mineral deposits can reduce solar panel output by 15–25% or more. Rain doesn’t fully clean panels — it leaves mineral residue that builds up over time. Professional cleaning uses purified deionized water and soft brushes that remove all contaminants without scratching the glass or damaging the anti-reflective coating, ensuring maximum light absorption and energy production.
How often should solar panels be cleaned?
Two to four times per year for most installations. More frequent cleaning is recommended in dusty environments, near agricultural areas, coastal locations with salt spray, or under heavy tree coverage with bird traffic. A single bird dropping covering one cell can reduce output for the entire string of panels it’s on — even small contamination has an outsized effect.
💡 Energy Savings Tip
Most solar owners recover the cost of professional cleaning within months through restored energy output — especially in summer when production is highest and contamination builds fastest.
Is it safe to use tap water or a hose to clean panels myself?
Not ideal. Tap water contains calcium, magnesium, and other minerals that leave spotting residue on the glass when it dries — which reduces clarity and light transmission. Using a hose also risks electrical shock if water gets into panel junction boxes or wiring. Professional cleaning uses deionized (purified) water that leaves no mineral residue, and our crews are trained in the electrical safety protocols required for roof-mounted systems.
Will cleaning void my solar panel warranty?
No — as long as cleaning is done correctly. Most manufacturers recommend or even require regular cleaning as part of maintenance. What can void warranties is using abrasive materials, harsh chemicals, or high-pressure water on the panel surface. We use only soft brushes, deionized water, and approved cleaning agents — methods that align with all major manufacturer guidelines.
Do you clean ground-mounted solar arrays as well as roof panels?
Yes. Ground-mounted systems are often easier to access and tend to accumulate more dust, debris, and vegetation contact than roof-mounted panels. We service both residential and commercial solar arrays of all sizes and configurations.
The Bottom Line
The Bottom Line
Why NorTech is the right exterior cleaning partner — and what you can expect from every job.
Why choose NorTech for exterior cleaning?
NorTech brings the right method, the right chemistry, and trained professionals to every exterior cleaning job. We don’t use one-size-fits-all pressure washing — we assess each surface and choose the technique that cleans thoroughly without causing damage. Every job is backed by our Satisfaction Guarantee and 1-Year Labor Warranty, and our eco-friendly solutions protect your landscaping, family, and pets while delivering professional results.
Does regular exterior cleaning actually protect my property’s value?
Absolutely. Mold, algae, and grime don’t just look bad — they actively degrade surfaces. Algae eats roofing material, mold penetrates siding, debris clogs gutters that then damage foundations, and mineral deposits etch glass. Regular cleaning prevents these conditions from progressing to structural damage, preserving your property’s value and avoiding repair costs that far exceed the cost of maintenance. Clean homes also appraise higher and sell faster.
What’s the first step to booking exterior cleaning?
Request a free quote at nortech.site. Tell us which surfaces you need cleaned and your property size, and we’ll provide an upfront estimate before booking. Same-day service is available in 100+ cities. First-time customers save 15% with code NORTECH15.
Ready to Book?
Use code NORTECH15 for 15% off your first service. Request your free quote →
Is NorTech’s exterior cleaning work guaranteed?
Yes. Every exterior cleaning service is backed by our 72-hour Satisfaction Review Window — we don’t finalize payment until you’ve confirmed the work meets expectations. All labor is covered by our 1-Year Labor Warranty. If a workmanship issue arises within 12 months, we return and correct it at no additional cost.
Ready to Restore Your Property’s Exterior?
Eco-friendly solutions. Surface-safe techniques. Same-day service in 100+ cities. Backed by our 1-Year Labor Warranty.
