Most Long Island homes need house washing once per year. Some homes need cleaning every 8 to 12 months. Others may remain clean for up to 18 months.
The correct schedule depends on more than the calendar. Consider your siding material, tree coverage, shade, distance from the coast, and the type of buildup on the exterior.
Nassau and Suffolk County homes are exposed to humidity, pollen, salt air, road grime, and seasonal storms. These conditions can make algae, mildew, and surface residue return faster than homeowners expect.
Use this guide to set a practical house washing schedule for your property.
The Basic House Washing Schedule
Use these intervals as a starting point:
- Typical Long Island home: Once every 12 months.
- Home near the ocean or a bay: Every 8 to 12 months.
- Home surrounded by trees or heavy shade: Every 8 to 12 months.
- Sunny home with limited tree coverage: Every 12 to 18 months.
- Home with recurring algae or mildew: Every 6 to 12 months.
- Home being prepared for sale or repainting: Wash as needed before the project.
A home does not need cleaning simply because a certain number of months has passed. Visible buildup is also a scheduling indicator.
Inspect the north-facing walls, areas below gutters, siding near shrubs, and surfaces near driveways. These areas usually show contamination first.
Frequency by What Is Growing or Collecting on the Siding
Different contaminants require different timing.
Algae
Algae commonly appears as green streaks or green patches. It grows faster on damp siding that receives limited sunlight.
North-facing walls, shaded areas, and siding behind shrubs are common locations. Homes with recurring algae may need house washing every 8 to 12 months.
Soft washing is usually the appropriate method for algae on siding. It treats the organic growth without relying on aggressive water pressure.
Mildew
Mildew may appear as gray, black, or brown spotting. It is more common where moisture remains on the surface.
Check around windows, under eaves, near gutters, and behind landscaping. If mildew returns quickly after cleaning, improve airflow by trimming nearby vegetation and correcting sprinkler overspray.
Schedule cleaning when mildew becomes visible. Do not wait for the entire exterior to become discolored.
Pollen
Long Island pollen can cover siding during spring. The residue may appear yellow, green, or dusty. Pollen can also collect on trim, soffits, gutters, and porch ceilings.
A spring cleaning can remove winter residue before peak pollen. A late-spring or early-summer wash can remove pollen after the heaviest release has passed.
If pollen is the only issue, an annual house washing schedule may be sufficient. Homes surrounded by mature trees may benefit from an additional spring inspection.
Road Grime
Homes near busy roads can collect exhaust residue, dust, mud, and splashback on lower siding. Driveway-adjacent walls can also collect tire residue and soil.
Inspect the lower three to four feet of siding. Pay attention to areas behind parked vehicles and near garage doors.
Annual cleaning is usually appropriate. Schedule an earlier service if the lower siding develops a dull film or dark splash marks.
Salt Spray
Salt air affects homes near the Atlantic Ocean, Long Island Sound, bays, and inlets. Winter road salt can also collect on lower siding, brick, and foundation areas.
Salt residue can make surfaces look cloudy or dull. It can also hold additional dirt on the exterior.
Coastal properties should generally plan for house washing every 8 to 12 months. A light rinse after major coastal storms may help reduce surface residue. Use caution around windows, doors, outlets, and exterior fixtures.
A Season-by-Season House Washing Guide
Winter: Inspect and Avoid Freezing Conditions
Winter is usually not the primary house washing season. Freezing temperatures can affect cleaning solutions, rinse water, and drying time.
Use winter for inspection. Look for:
- Salt residue near the foundation.
- Dark streaks below gutters.
- Damaged siding or trim.
- Failed caulk around windows.
- Areas where water collects.
- New algae or mildew on shaded walls.
Do not schedule exterior washing when water may freeze on surfaces or walkways. Wait for a suitable weather window.
Spring: Remove Winter and Pollen Buildup
Spring is a useful time to wash a home after the last hard freezes. Cleaning can remove salt, winter grime, storm residue, and early pollen.
Schedule in early spring if winter buildup is the main concern. Schedule in late spring if pollen is heavy and you want to clean after the peak release.
Spring is also a good time to inspect siding before summer humidity increases. Address loose panels, damaged trim, open seams, and leaking gutters before washing.
Summer: Monitor Growth and Moisture
Summer humidity can accelerate algae and mildew growth. Shade and frequent rain can keep siding damp for extended periods.
Inspect the property during summer. Check north-facing walls and areas beneath trees. Look for green streaks, dark spots, and a slick surface.
A home cleaned in spring may only need a spot treatment during summer. A shaded or coastal property may need a full house wash if visible growth returns.
Early Fall: The Best General Window
Early fall is often the best time for house washing on Long Island.
By this point, the exterior has collected summer humidity, pollen, dust, salt residue, insect debris, and general grime. Washing in early fall removes this buildup before winter weather arrives.
Early fall also provides time to identify exterior maintenance issues. Check the siding, trim, windows, gutters, downspouts, and foundation areas after cleaning.
Schedule before freezing temperatures become consistent. If your property has many trees, complete house washing before heavy leaf drop whenever possible. Handle gutter cleaning later if needed, after most leaves have fallen.
Early fall is especially useful for homes in Nassau and Suffolk County that have:
- Coastal exposure.
- Heavy shade.
- Recurring mildew.
- Mature trees.
- Recent exterior repairs.
- A planned sale or repainting project.
How Often Should Each Siding Material Be Washed?
Vinyl Siding
Most vinyl siding should be soft washed. Low pressure and an appropriate cleaning solution help remove algae, mildew, pollen, and salt film.
Plan for cleaning every 12 to 18 months in a relatively open, sunny location. Use a shorter 8- to 12-month interval for shaded or coastal homes.
Avoid using excessive pressure. High pressure can force water behind panels or damage seams and trim.
Brick
Brick walls and brick flatwork require different approaches. Durable brick surfaces may tolerate controlled pressure. Older brick and deteriorated mortar require greater care.
Inspect brick annually. Wash when you see algae, mildew, salt deposits, or dark atmospheric staining.
Use controlled pressure for suitable masonry. Use a lower-pressure cleaning method when the brick, mortar, or surrounding materials are fragile.
Cedar
Cedar siding and shingles require a gentle process. High pressure can scar the wood, remove fibers, and strip protective coatings.
Soft washing is generally the safer approach. Inspect cedar every year. Many homes need cleaning every 18 to 36 months, but shaded and coastal homes may need service closer to once per year.
Cleaning does not replace staining, sealing, or repairs. Address damaged boards before washing.
Stucco
Stucco is porous and can be damaged by excessive pressure. Soft washing is usually preferred for removing organic growth and surface dirt.
Inspect stucco annually. A typical interval is 12 to 24 months. Shorten the interval when the home has heavy shade, salt exposure, irrigation overspray, or recurring mildew.
Check for cracks and damaged areas before scheduling service.
Soft Washing vs. Pressure Washing for Siding
Soft washing uses a cleaning solution and controlled low-pressure rinsing. It is commonly used for:
- Vinyl siding.
- Cedar.
- Painted wood.
- Stucco.
- Soffits and trim.
- Areas with algae or mildew.
Pressure washing uses stronger water pressure to remove embedded dirt from durable surfaces. It is more commonly used for:
- Concrete.
- Walkways.
- Driveways.
- Pavers.
- Some brick and masonry.
The correct method depends on the surface condition. Read the JMS guide to soft washing versus pressure washing before choosing a process.
Do not use the same pressure setting across the entire property. Siding, windows, trim, brick, and concrete have different requirements.
Warning Signs Your House Washing Is Overdue
Schedule an inspection or cleaning when you notice:
- Green streaks on siding.
- Black or gray spots.
- A dull film on the exterior.
- Mildew below gutters.
- Dirt buildup around windows.
- Dark splash marks near driveways.
- Salt residue on lower walls.
- Algae behind shrubs.
- Spider webs and insect debris around eaves.
- A noticeable difference between shaded and sunny walls.
Do not wait until every wall has visible staining. Early cleaning is usually easier than removing heavy buildup.
A Practical Schedule for Your Home
Use this simple process:
- Inspect the exterior in spring.
- Check for algae and mildew during summer.
- Schedule the main house washing in early fall.
- Shorten the interval to 8 to 12 months for shaded or coastal homes.
- Use a 12- to 18-month interval for sunny homes with limited buildup.
- Schedule sooner when visible growth appears.
- Coordinate house washing with gutter and exterior maintenance.
Review the JMS house washing guide for preparation and contractor questions. You can also view the company’s power washing photos and request a house washing quote.
Frequently Asked Questions
How often should a house be washed on Long Island?
Most homes need house washing once per year. Coastal, shaded, and tree-covered properties may need cleaning every 8 to 12 months.
Is early fall better than spring for house washing?
Early fall is often the best general window because it removes summer buildup before winter. Spring is also appropriate for homes with heavy winter residue or early-season grime.
Should I wash my house if I only see a few green streaks?
Yes. Small areas of algae can indicate that conditions support additional growth. Schedule targeted cleaning or plan the next full wash.
Is pressure washing safe for vinyl siding?
High pressure can damage vinyl siding or force water behind panels. Soft washing with controlled rinsing is generally the safer method.
How often should cedar siding be washed?
Inspect cedar annually. Many cedar homes need cleaning every 18 to 36 months. Heavy shade and coastal exposure can shorten that interval.
Should gutters be cleaned at the same time?
House washing and gutter cleaning are separate services. They can often be scheduled during the same seasonal maintenance period. Clean gutters after most leaves have fallen.
How can I request a quote?
Visit the JMS Pressure Wash quote page or use the Long Island contact page. Provide your name, Email, Website if applicable, service address, siding material, and preferred service date.