How Often Should You Pressure Wash in the Florida Keys?

If you’ve recently moved to the Florida Keys or purchased a vacation property in Key West, you may have noticed something that mainland Florida homeowners rarely deal with: surfaces here get dirty fast.

Your driveway was clean in November. By March it’s streaked green. The exterior walls you painted two years ago are showing dark mildew patches. The pool deck has gone from white to gray. You didn’t do anything wrong — this is just what living in one of the most demanding climates in North America does to outdoor surfaces.

So how often do you actually need to pressure wash down here? The answer is different than almost anywhere else in the country — and understanding why helps you plan smarter and protect your property better.

Why the Florida Keys Are Different

Most pressure washing guides online are written for the suburbs of Atlanta, Phoenix, or the Midwest. They’ll tell you to pressure wash your home every one to two years. That advice does not apply in Monroe County.

Three environmental factors make the Lower Keys uniquely hard on exterior surfaces:

Salt air. Key West sits at the end of a chain of islands in the middle of the ocean. Salt particles from Florida Bay and the Atlantic coat every outdoor surface constantly. Salt film is corrosive, traps moisture against surfaces, and creates a sticky base layer that other contaminants adhere to. If you’ve wiped a finger across your window glass or car hood after a few weeks near the water, you know what salt film feels like.

Humidity. The Florida Keys average relative humidity above 75% year-round, with summer months regularly hitting 85–90%. Mold, mildew, and algae thrive in exactly these conditions. Unlike dry climates where biological growth on exterior surfaces is rare, in Key West it is essentially guaranteed and continuous.

Tropical rainfall. The Keys get significant rainfall, especially during the summer wet season. Rainfall combined with high humidity and warm temperatures creates perfect conditions for algae and mildew to establish and spread quickly on concrete, stucco, wood, and painted surfaces.

The result: surfaces in Key West degrade visually — and structurally — faster than almost anywhere else in the continental United States.

The General Rule for Key West Homeowners

Every 6 to 12 months is the baseline for most Key West residential properties. That’s twice as frequent as the standard recommendation for most of the country.

Here’s a more specific breakdown:

Every 3–6 months:
– Driveways with heavy shade cover or near large trees
– Pool decks and outdoor entertaining areas that see constant moisture
– vacation properties where exterior appearance directly affects guest reviews and bookings
– Properties on stilts or near the water with maximum salt air exposure
– Commercial properties with high foot traffic

Every 6–12 months:
– Standard residential home exteriors (stucco, concrete block, Hardie board)
– Fences and perimeter walls
– Walkways and sidewalks
– Home exteriors with full sun exposure (UV helps inhibit some biological growth)

Every 12–18 months:
– Surfaces that receive significant direct sun all day
– Recently sealed concrete or paver surfaces (sealing extends the clean significantly)
– Properties on drier, higher-elevation lots with good drainage

The Two-Season Schedule That Works for Most Homeowners

If you want a simple framework without overthinking it, this is what works well for most Key West and Lower Keys properties:

Wash #1: October/November
Right after hurricane season ends and before the busy tourist and snowbird season begins. Your property looks its best when the most people are seeing it. This is also when you want to address any buildup or staining from summer storms.

Wash #2: May/June
Before hurricane season starts. Clean gutters, clean surfaces, and clear any organic buildup before tropical storms start dumping rain. A thorough pressure wash before storm season also gives you a clear baseline for documenting property condition for insurance purposes.

This twice-yearly approach keeps most Key West properties looking consistently maintained without over-scheduling service.

What Happens If You Wait Too Long

Skipping pressure washing for 18–24 months in the Keys isn’t just a cosmetic problem — it’s a maintenance problem.

Mold and algae that sit on porous surfaces like stucco and concrete don’t just rest on top. Over time they penetrate, causing micro-cracking that allows moisture into the substrate. On wood surfaces, long-term biological growth accelerates rot. On painted surfaces, it breaks down the bond between paint and substrate, leading to peeling and blistering that requires full repainting rather than just washing.

Properties that go 2+ years without pressure washing in the Keys often require two cleaning passes or pre-treatment to remove deeply embedded organic growth — which costs more than a standard wash.

Regular cleaning is cheaper than the repairs that deferred maintenance causes. In the Florida Keys, the math is especially clear.

Signs You Need Pressure Washing Now

Don’t wait for the calendar if you notice any of these:

• Green or black streaking on exterior walls, especially on the north or shaded sides
• Driveway surface has turned from its original color to green, gray, or brown
• Pool deck surface feels slippery or looks discolored
• Dark staining under gutters or downspouts on exterior walls
• Windows showing a white haze that doesn’t clean off with normal washing
• Fence or gate surfaces showing dark mold patches
• Your property looks noticeably less maintained than neighboring homes

Any of these is a sign that biological growth has established on the surface and needs professional removal before it gets worse.

A Note on Soft Washing vs. Pressure Washing

Not every surface in the Keys should be pressure washed. Historic wood-frame homes, painted surfaces, roofs, and some stucco finishes require soft washing — a low-pressure method using biodegradable cleaning solutions — rather than high-pressure water. High pressure on the wrong surface can strip paint, damage wood, or crack tiles.

A qualified exterior cleaning company will assess your surfaces before choosing the method. If you’re unsure, always ask.

When to Schedule

The best time to schedule pressure washing in Key West is before peak season (October) and before storm season (May). Both windows tend to book up quickly as other homeowners and property managers are thinking the same thing.

If you’re managing a vacation property, scheduling around guest turnover windows is also something your service provider should be able to accommodate.

Under The Sun Property Care serves Key West and the Lower Keys from Key West to Big Pine Key. For a free estimate or to discuss a seasonal maintenance schedule, call (786) 933-0510 or contact us through our website.

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