Use appearance, not a rigid interval
A practical trigger is visible buildup, slippery film on walking surfaces, or a property standard you want to maintain.
Guide
There is no single useful calendar for every property. Exposure, shade, irrigation, traffic, landscaping and surface material can all change how quickly buildup becomes visible.

A useful maintenance interval comes from the property itself: watch shaded walls, irrigation overspray, high-traffic areas and surfaces that stay damp longer.
A practical trigger is visible buildup, slippery film on walking surfaces, or a property standard you want to maintain.
A shaded enclosure, sunny driveway and painted exterior wall do not collect or show buildup in the same way.
More frequent or more aggressive cleaning is not automatically better. The method should match the material and condition.
For rentals, sales preparation or recurring maintenance, the right cadence is the one that keeps the property at the standard you need without unnecessary work.
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Practical guide
Florida heat, humidity, shade, irrigation, tree cover and storm seasons can make two nearby properties age very differently. A shaded north-facing wall may show organic growth sooner than a sunny wall. A driveway beneath trees may collect staining faster than an open one. That is why a fixed “every X months” rule is less useful than watching the surfaces themselves.
A practical inspection looks for dark organic growth, slippery areas, visible film, irrigation deposits, traffic grime and changes near gutters or downspouts. Cleaning before buildup becomes severe can simplify maintenance, but unnecessary cleaning should also be avoided. The right interval is property-specific.
North-facing walls, dense landscaping and overspray from sprinklers can stay damp longer and show buildup sooner.
Traffic, tree debris and standing water can make flatwork look dirty faster than protected walls.
Humidity, splashing, landscaping and screen exposure can change how quickly these areas need attention.
Check for dark organic growth, slippery areas and streaking where water repeatedly travels.
Corners, expansion joints, shaded borders and areas beside planters often show change before open surfaces.
Cleaning more often is not automatically better. Surface condition and the correct method matter more than a rigid schedule.